delivered the opinion of the Court.
“It is a principle of general application in Anglo-American jurisprudence that one is not bound by a judgment
in personam
in a litigation in which he is not designated as a party or to which he has not been made a party by service of process.”
Hansberry
v.
Lee,
*885 The virtual representation question we examine in this opinion arises in the following context. Petitioner Brent Taylor filed a lawsuit under the Freedom of Information Act seeking certain documents from the Federal Aviation Administration. Greg Herrick, Taylor’s friend, had previously brought an unsuccessful suit seeking the same records. The two men have no legal relationship, and there is no evidence that Taylor controlled, financed, participated in, or even had notice of Herrick’s earlier suit. Nevertheless, the D. C. Circuit held Taylor’s suit precluded by the judgment against Herrick because, in that court’s assessment, Herrick qualified as Taylor’s “virtual representative.”
We disapprove the doctrine of preclusion by “virtual representation,” and hold, based on the record as it now stands, that the judgment against Herrick does not bar Taylor from maintaining this suit.
The Freedom of Information Act (FOIA or Act) accords “any person” a right to request any records held by a federal agency. 5 U. S. C. § 552(a)(3)(A) (2006 ed.). No reason need be given for a FOIA request, and unless the requested materials fall within one of the Act’s enumerated exemptions, see § 552(a)(3)(E), (b), the agency must “make the records promptly available” to the requester, § 552(a)(3)(A). If an agency refuses to furnish the requested records, the requester may file suit in federal court and obtain an injunction “order[ing] the production of any agency records improperly withheld.” § 552(a)(4)(B).
I
The courts below held the instant FOIA suit barred by the judgment in earlier litigation seeking the same records. Because the lower courts’ decisions turned on the connection between the two lawsuits, we begin with a full account of each action.
A
The first suit was filed by Greg Herrick, an antique aircraft enthusiast and the owner of an F-45 airplane, a vintage *886 model manufactured by the Fairchild Engine and Airplane Corporation (FEAC) in the 1930’s. In 1997, seeking information that would help him restore his plane to its original condition, Herrick filed a FOIA request asking the Federal Aviation Administration (FAA) for copies of any technical documents about the F-45 contained in the agency’s records.
To gain a certificate authorizing the manufacture and sale of the F-45, FEAC had submitted to the FAA’s predecessor, the Civil Aeronautics Authority, detailed specifications and other technical data about the plane. Hundreds of pages of documents produced by FEAC in the certification process remain in the FAA’s records. The FAA denied Herrick’s request, however, upon finding that the documents he sought are subject to FOIA’s exemption for “trade secrets and commercial or financial information obtained from a person and privileged or confidential,” § 552(b)(4). In an administrative appeal, Herrick urged that FEAC and its successors had waived any trade-secret protection. The FAA thereupon contacted FEAC’s corporate successor, respondent Fairchild Corporation (Fairchild). Because Fairchild objected to release of the documents, the agency adhered to its original decision.
Herrick then filed suit in the U. S. District Court for the District of Wyoming. Challenging the FAA’s invocation of the trade-secret exemption, Herrick placed heavy weight on a 1955 letter from FEAC to the Civil Aeronautics Authority. The letter authorized the agency to lend any documents in its files to the public “for use in making repairs or replacement parts for aircraft produced by Fairchild.”
Herrick
v.
Garvey,
Rejecting Herrick’s argument, the District Court granted summary judgment to the FAA. Herrick v. Garvey, 200 *887 F. Supp. 2d 1321, 1328-1329 (Wyo. 2000). The 1955 letter, the court reasoned, did not deprive the F-45 certification documents of trade-secret status, for those documents were never in fact released pursuant to the letter’s blanket authorization. See id., at 1329. The court also stated that even if the 1955 letter had waived trade-secret protection, Fairchild had successfully “reversed” the waiver by objecting to the FAA’s release of the records to Herrick. Ibid.
On appeal, the Tenth Circuit agreed with Herrick that the 1955 letter had stripped the requested documents of trade-secret protection. See
Herrick,
In so ruling, the Tenth Circuit noted that Herrick had failed to challenge two suppositions underlying the District Court’s decision. First, the District Court assumed trade-secret status could be “restored” to documents that had lost protection. Id., at 1194, n. 10. Second, the District Court also assumed that Fairchild had regained trade-secret status for the documents even though the company claimed that status only “after Herrick had initiated his request” for the F-45 records. Ibid. The Court of Appeals expressed no opinion on the validity of these suppositions. See id., at 1194-1195, n. 10.
B
The Tenth Circuit’s decision issued on July 24,2002. Less than a month later, on August 22, petitioner Brent Taylor— a friend of Herrick’s and an antique aircraft enthusiast in his own right — submitted a FOIA request seeking the same documents Herrick had unsuccessfully sued to obtain. When the FAA failed to respond, Taylor filed a complaint in the U. S. District Court for the District of Columbia. Like Herrick, Taylor argued that FEAC’s 1955 letter had stripped *888 the records of their trade-secret status. But Taylor also sought to litigate the two issues concerning recapture of protected status that Herrick had failed to raise in his appeal to the Tenth Circuit.
After Fairchild intervened as a defendant,
1
the District Court in D. C. concluded that Taylor’s suit was barred by claim preclusion; accordingly, it granted summary judgment to Fairchild and the FAA. The court acknowledged that Taylor was not a party to Herrick’s suit. Relying on the Eighth Circuit’s decision in
Tyus
v.
Schoemehl,
The Eighth Circuit’s seven-factor test for virtual representation, adopted by the District Court in Taylor’s case, requires an “identity of interests” between the person to be bound and a party to the judgment. See
id.,
at 31a. See also
Tyus,
*889 The record before the District Court in Taylor’s suit revealed the following facts about the relationship between Taylor and Herrick: Taylor is the president of the Antique Aircraft Association, an organization to which Herrick belongs; the two men are “close associate^],” App. 54; Herrick asked Taylor to help restore Herrick’s F-45, though they had no contract or agreement for Taylor’s participation in the restoration; Taylor was represented by the lawyer who represented Herrick in the earlier litigation; and Herrick apparently gave Taylor documents that Herrick had obtained from the FAA during discovery in his suit.
Fairchild and the FAA conceded that Taylor had not participated in Herrick’s suit. App. to Pet. for Cert. 32a. The D. C. District Court determined, however, that Herrick ranked as Taylor’s virtual representative because the facts fit each of the other six indicators on the Eighth Circuit’s list. See id., at 32a-35a. Accordingly, the District Court held Taylor’s suit, seeking the same documents Herrick had requested, barred by the judgment against Herrick. See id., at 35a.
The D. C. Circuit affirmed. It observed, first, that other Circuits “vary widely” in their approaches to virtual representation.
Taylor
v.
Blakey,
Rejecting both of these approaches, the D. C. Circuit announced its own five-factor test. The first two factors— “identity of interests” and “adequate representation” — are necessary but not sufficient for virtual representation.
Applying this test to the record in Taylor’s case, the D. C. Circuit found both of the necessary conditions for virtual representation well met. As to identity of interests, the court emphasized that Taylor and Herrick sought the same result — release of the F-45 documents. Moreover, the D. C. Circuit observed, Herrick owned an F-45 airplane, and therefore had, “if anything, a stronger incentive to litigate” than Taylor, who had only a “general interest in public disclosure and the preservation of antique aircraft heritage.” Id., at 973 (internal quotation marks omitted).
Turning to adequacy of representation, the D. C. Circuit acknowledged that some other Circuits regard notice of a prior suit as essential to a determination that a nonparty was adequately represented in that suit. See
id.,
at 973-974 (citing
Perez
v.
Volvo Car Corp.,
The D. C. Circuit also found its “close relationship” criterion met, for Herrick had “asked Taylor to assist him in restoring his F-45” and “provided information to Taylor that Herrick had obtained through discovery”; furthermore, Taylor “did not oppose Fairchild’s characterization of Herrick *891 as his ‘close associate.’” Id., at 975. Because the three above-described factors sufficed-to establish virtual representation under the D. C. Circuit’s five-factor test, the appeals court left open the question whether Taylor had engaged in “tactical maneuvering.” See id., at 976 (calling the facts bearing on tactical maneuvering “ambigu[ous]”). 2
We granted certiorari,
II
The preclusive effect of a federal-court judgment is determined by federal common law. See
Semtek Int’l Inc.
v.
Lockheed Martin Corp.,
*892 Taylor’s case presents an issue of first impression in this sense: Until now, we have never addressed the doctrine of “virtual representation” adopted (in varying forms) by several Circuits and relied upon by the courts below. Our inquiry, however, is guided by well-established precedent regarding the propriety of nonparty preclusion. We review that precedent before taking up directly the issue of virtual representation.
A
The preclusive effect of a judgment is defined by claim preclusion and issue preclusion, which are collectively referred to as “res judicata.”
5
Under the doctrine of claim preclusion, a final judgment forecloses “successive litigation of the very same claim, whether or not relitigation of the claim raises the same issues as the earlier suit.”
New Hampshire
v.
Maine,
A person who was not a party to a suit generally has not had a “full and fair opportunity to litigate” the claims and issues settled in that suit. The application of claim and issue preclusion to nonparties thus runs up against the “deep-
*893
rooted historic tradition that everyone should have his own day in court.”
Rickards,
B
Though hardly in doubt, the rule against nonparty preclusion is subject to exceptions. For present purposes, the recognized exceptions can be grouped into six categories. 6
First, “[a] person who agrees to be bound by the determination of issues in an action between others is bound in accordance with the terms of his agreement.” 1 Restatement (Second) of Judgments §40, p. 390 (1980) (hereinafter Restatement). For example, “if separate actions involving the same transaction are brought by different plaintiffs against the same defendant, all the parties to all the actions may agree that the question of the defendant’s liability will be definitely determined, one way or the other, in a ‘test case.’” D. Shapiro, Civil Procedure: Preclusion in Civil Actions 77-78 (2001) (hereinafter Shapiro). See also
California
v.
Texas,
Second, nonparty preclusion may be justified based on a variety of pre-existing “substantive legal relationship[s]” between the person to be bound and a party to the judgment. Shapiro 78. See also
Richards,
Third, we have confirmed that, “in certain limited circumstances,” a nonparty may be bound by a judgment because she was “adequately represented by someone with the same interests who [wa]s a party” to the suit.
Richards,
Fourth, a nonparty is bound by a judgment if she “assumed] control” over the litigation in which that judgment was rendered.
Montana,
Fifth, a party bound by a judgment may not avoid its preclusive force by relitigating through a proxy. Preclusion is thus in order when a person who did not participate in a litigation later brings suit as the designated representative of a person who was a party to the prior adjudication. See
Chicago, R. I. & P. R. Co.
v.
Schendel,
Sixth, in certain circumstances a special statutory scheme may “expressly foreclos[e] successive litigation by non-litigants ... if the scheme is otherwise consistent with due process.”
Martin,
Ill
Reaching beyond these six established categories, some lower courts have recognized a “virtual representation” exception to the rule against nonparty preclusion. Decisions of these courts, however, have been far from consistent.
*896
See 18A Wright & Miller § 4457, at 513 (virtual representation lacks a “clear or coherent theory”; decisions applying it have “an episodic quality”). Some Circuits use the label, but define “virtual representation” so that it is no broader than the recognized exception for adequate representation. See,
e. g., Becherer
v.
Merrill Lynch, Pierce, Fenner & Smith, Inc.,
The D. C. Circuit, the FAA, and Fairchild have presented three arguments in support of an expansive doctrine of virtual representation. We find none of them persuasive.
A
The D. C. Circuit purported to ground its virtual representation doctrine in this Court’s decisions stating that, in some circumstances, a person may be bound by a judgment if she was adequately represented by a party to the proceeding yielding that judgment. See
In
Richards,
we reviewed a decision by the Alabama Supreme Court holding that a challenge to a tax was barred by a judgment upholding the same tax in a suit filed by different taxpayers.
The D. C. Circuit stated, without elaboration, that it did not “read
Richards
to hold a nonparty ... adequately represented only if special procedures were followed [to protect the nonparty] or the party to the prior suit understood it was representing the nonparty.”
The D. C. Circuit misapprehended
Richards.
As just recounted, our holding that the Alabama Supreme Court’s application of res judicata to nonparties violated due process turned on the lack of either special procedures to protect the nonparties’ interests or an understanding by the concerned parties that the first suit was brought in a representative capacity. See
Richards,
We restated
Richards’
core holding in
South Central Bell Telephone Co.
v.
Alabama,
Our decisions recognizing that a nonparty may be bound by a judgment if she was adequately represented by a party to the earlier suit thus provide no support for the D. C. Circuit’s broad theory of virtual representation.
B
Fairchild and the FAA do not argue that the D. C. Circuit’s virtual representation doctrine fits within any of the recognized grounds for nonparty preclusion. Rather, they ask us to abandon the attempt to delineate discrete grounds and clear rules altogether. Preclusion is in order, they contend, whenever “the relationship between a party and a non-party is ‘close enough’ to bring the second litigant within the judgment.” Brief for Respondent Fairchild 20. See also Brief for Respondent FAA 22-24. Courts should make the “close enough” determination, they urge, through a “heavily fact-driven” and “equitable” inquiry. Brief for Respondent Fair-child 20. See also Brief for Respondent FAA 22 (“there is no clear test” for nonparty preclusion; rather, an “equitable and fact-intensive” inquiry is demanded (internal quotation marks omitted)). Only this sort of diffuse balancing, Fair-child and the FAA argue, can account for all of the situations in which nonparty preclusion is appropriate.
We reject this argument for three reasons. First, our decisions emphasize the fundamental nature of the general rule that a litigant is not bound by a judgment to which she was not a party. See,
e. g., Richards,
*899
Resisting this reading of our precedents, respondents call up three decisions they view as supportive of the approach they espouse. Fairchild quotes our statement in
Coryell
v.
Phipps,
The FAA relies on
United States
v.
Des Moines Valley R. Co.,
Our second reason for rejecting a broad doctrine of virtual representation rests on the limitations attending nonparty preclusion based on adequate representation. A party’s representation of a nonparty is “adequate” for preclusion purposes only if, at a minimum: (1) The interests of the non-party and her representative are aligned, see
Hansberry,
An expansive doctrine of virtual representation, however, would “recogniz[e], in effect, a common-law kind of class action.”
Tice,
Third, a diffuse balancing approach to nonparty preclusion would likely create more headaches than it relieves. Most obviously, it could significantly complicate the task of district courts faced in the first instance with preclusion questions. An all-things-considered balancing approach might spark wide-ranging, time-consuming, and expensive discovery tracking factors potentially relevant under seven- or five-prong tests. And after the relevant facts are established, district judges would be called upon to evaluate them under a standard that provides no firm guidance. See
Tyus,
*902 c
Finally, relying on the Eighth Circuit’s decision in
Tyus,
Taylor’s FOIA action falls within the category described in
Richards,
the FAA contends, because “the duty to disclose under FOIA is owed to the public generally.” Brief for Respondent FAA 34. The opening sentence of FOIA, it is true, states that agencies “shall make [information] available to the public.” 5 U. S. C. § 552(a) (2006 ed.). Equally true, we have several times said that FOIA vindicates a “public” interest.
E. g., National Archives and Records Admin,
v.
Favish,
Furthermore, we said in
Richards
only that, for the type of public-law claims there envisioned, States are free to adopt procedures limiting repetitive litigation. See
The FAA next argues that “the threat of vexatious litigation is heightened” in public-law cases because “the number of plaintiffs with standing is potentially limitless.” Brief for Respondent FAA 28 (internal quotation marks omitted). FOIA does allow “any person” whose request is denied to resort to federal court for review of the agency’s determination. 5 U. S. C. § 552(a)(3)(A), (4)(B) (2006 ed.). Thus it is theoretically possible that several persons could coordinate to mount a series of repetitive lawsuits.
But we are not convinced that this risk justifies departure from the usual rules governing nonparty preclusion. First, stare decisis will allow courts swiftly to dispose of repetitive suits brought in the same circuit. Second, even when stare *904 decisis is not dispositive, “the human tendency not to waste money will deter the bringing of suits based on claims or issues that have already been adversely determined against others.” Shapiro 97. This intuition seems to be borne out by experience: The FAA has not called our attention to any instances of abusive FOIA suits in the Circuits that reject the virtual representation theory respondents advocate here.
IV
For the foregoing reasons, we disapprove the theory of virtual representation on which the decision below rested. The preclusive effects of a judgment in a federal-question case decided by a federal court should instead be determined according to the established grounds for nonparty preclusion described in this opinion. See Part II-B, supra.
Although references to “virtual representation” have proliferated in the lower courts, our decision is unlikely to occasion any great shift in actual practice. Many opinions use the term “virtual representation” in reaching results at least arguably defensible on established grounds. See 18A Wright & Miller §4457, at 535-539, and n. 38 (collecting cases). In these cases, dropping the “virtual representation” label would lead to .clearer analysis with little, if any, change in outcomes. See
Tice,
In some cases, however, lower courts have relied on virtual representation to extend nonparty preclusion beyond the latter doctrine’s proper bounds. We now turn back to Taylor’s action to determine whether his suit is such a case, or whether the result reached by the courts below can be justified on one of the recognized grounds for nonparty preclusion.
A
It is uncontested that four of the six grounds for nonparty preclusion have no application here: There is no indication *905 that Taylor agreed to be bound by Herrick’s litigation, that Taylor and Herrick have any legal relationship, that Taylor exercised any control over Herrick’s suit, or that this suit implicates any special statutory scheme limiting relitigation. Neither the FA A nor Fairchild contends otherwise.
It is equally clear that preclusion cannot be justified on the theory that Taylor was adequately represented in Herrick’s suit. Nothing in the record indicates that Herrick understood himself to be suing on Taylor’s behalf, that Taylor even knew of Herrick’s suit, or that the Wyoming District Court took special care to protect Taylor’s interests. Under our pathmarking precedent, therefore, Herrick’s representation was not “adequate.” See
Richards,
That leaves only the fifth category: preclusion because a nonparty to an earlier litigation has brought suit as a representative or agent of a party who is bound by the prior adjudication. Taylor is not Herrick’s legal representative and he has not purported to sue in a representative capacity. He concedes, however, that preclusion would be appropriate if respondents could demonstrate that he is acting as Herrick’s “undisclosed agen[t].” Brief for Petitioner 23, n. 4. See also id., at 24, n. 5.
Respondents argue here, as they did below, that Taylor’s suit is a collusive attempt to relitigate Herrick’s action. See Brief for Respondent Fairchild 32, and n. 18; Brief for Respondent FAA 18-19, 33, 39. The D. C. Circuit considered a similar question in addressing the “tactical maneuvering” prong of its virtual representation test. See
*906 We have never defined the showing required to establish that a nonparty to a prior adjudication has become a litigating agent for a party to the earlier case. Because the issue has not been briefed in any detail, we do not discuss the matter elaboratively here. We note, however, that courts should be cautious about finding preclusion on this basis. A mere whiff of “tactical maneuvering” will not suffice; instead, principles of agency law are suggestive. They indicate that preclusion is appropriate only if the putative agent’s conduct of the suit is subject to the control of the party who is bound by the prior adjudication. See 1 Restatement (Second) of Agency § 14, p. 60 (1957) (“A principal has the right to control the conduct of the agent with respect to matters entrusted to him.”). 13
B
On remand, Fairchild suggests, Taylor should bear the burden of proving he is not acting as Herrick’s agent. When a defendant points to evidence establishing a close relationship between successive litigants, Fairchild maintains, “the burden [should] shif[t] to the second litigant to submit evidence refuting the charge” of agency. Brief for Respondent Fairchild 27-28. Fairchild justifies this proposed burden-shift on the ground that “it is unlikely an opposing party will have access to direct evidence of collusion.” Id., at 28, n. 14.
*907
We reject Fairchild’s suggestion. Claim preclusion, like issue preclusion, is an affirmative defense. See Fed. Rule Civ. Proc. 8(c);
Blonder-Tongue,
* *
For the reasons stated, the judgment of the United States Court of Appeals for the District of Columbia Circuit is vacated, and the case is remanded for further proceedings consistent with this opinion.
It is so ordered.
Notes
Although Fairchild provided documents to the Wyoming District Court and filed an
amicus
brief in the Tenth Circuit, it was not a party to Herrick’s suit. See
Herrick
v.
Garvey,
The D. C. Circuit did not discuss the District Court’s distinction between public-law and private-law claims.
The Ninth Circuit applies a five-factor test similar to the D. C. Circuit’s. See
Kourtis
v.
Cameron,
For judgments in diversity cases, federal law incorporates the rules of preclusion applied by the State in which the rendering court sits. See
Semtek Int’l Inc.
v.
Lockheed Martin Corp.,
These terms have replaced a more confusing lexicon. Claim preclusion describes the rules formerly known as “merger” and “bar,” while issue preclusion encompasses the doctrines once known as “collateral estoppel” and “direct estoppel.” See
Migra
v.
Warren City School Dist. Bd. of Ed.,
The established grounds for nonparty preclusion could be organized differently. See, e. g., 1 & 2 Restatement (Second) of Judgments §§39-62 . (1980) (hereinafter Restatement); D. Shapiro, Civil Procedure: Preclusion in Civil Actions 75-92 (2001); 18A C. Wright, A. Miller, & E. Cooper, Federal Practice and Procedure § 4448, pp. 327-329 (2d ed. 2002) (hereinafter Wright & Miller). The list that follows is meant only to provide a framework for our consideration of virtual representation, not to establish a definitive taxonomy.
The Restatement observes that a nonparty may be bound not only by express or implied agreement, but also through conduct inducing reliance by others. See 2 Restatement § 62. See also 18A Wright & Miller § 4453, at 425-429. We have never had occasion to consider this ground for non-party preclusion, and we express no view on it here.
The substantive legal relationships justifying preclusion are sometimes collectively referred to as “privity.” See,
e. g., Richards
v.
Jefferson County,
Moreover,
Coryell
interpreted the term “privity” not in the context of res judicata, but as used in a statute governing shipowner liability. See
Coryell
v.
Phipps,
The FA A urges that there was no agency relationship between the landowner and the United States because the landowner did not control the U. S. Attorney’s conduct of the suit. See Tr. of Oral Arg. 33. That point is debatable. See
United States
v.
Des Moines Valley R. Co.,
Richards
suggested that notice is required in some representative suits,
e. g.,
class actions seeking monetary relief. See
Nonparty preclusion in such cases ranks under the sixth exception described above: special statutory schemes that expressly limit subsequent suits. See supra, at 895.
Our decision in
Montana
v.
United States,
