delivered the opinion of the Court.
Title IV of the Organized Crime Control Act of 1970, 18 U. S. C. § 1623 (1976 ed., Supp. I), prohibits false declarations made under oath “in any proceeding before or ancillary to any court or grand jury of the United States.”
1
This case turns
I
On June 16, 1976, petitioner Robert Dunn testified before a federal grand jury under a grant of immunity pursuant to 18 U. S. C. § 6002.
2
The grand jury was investigating illicit
Several months later, on September 30, 1976, Dunn arrived without counsel in the office of Musgrave’s attorney, Michael Canges. In the presence of Canges and a notary public, petitioner made an oral statement under oath in which he recanted his grand jury testimony implicating Musgrave. Canges subsequently moved to dismiss the indictment against Musgrave, alleging that it was based on perjured testimony. In support of this motion, the attorney submitted a transcript of Dunn’s September 30 statement.
The District Court held an evidentiary hearing on Mus-grave’s motion to dismiss on October 21, 1976. At that hearing, petitioner, who was then represented by counsel, adopted the statement he had given in Canges’ office and testified that only a small part of what he had told the grand jury was in fact true. App. 46. As a result of petitioner’s testimony, the Government reduced the charges against Mus-grave to misdemeanor possession of methamphetamine. See 21 U. S. C. § 844.
Petitioner was subsequently indicted on five counts of making false declarations in violation of 18 U. S. C. § 1623 (1976 ed., Supp. I). The indictment charged that Dunn’s testimony before the grand jury was inconsistent with statements made “on September 30, 1976, while under oath as a witness
At trial, the Government introduced over objection pertinent parts of Dunn’s grand jury testimony, his testimony at the October 21 evidentiary hearing, and his sworn statement to Musgrave’s attorney. After the Government rested its case, petitioner renewed his objections in a motion for acquittal. He contended that the September 30 statement was not made in a proceeding ancillary to a federal court or grand jury as required by § 1623 (c). In addition, Dunn argued that use of his grand jury testimony to prove an inconsistent declaration would contravene the Government’s promise of immunity, in violatioxl of 18 U. S. C. § 6002 and the Fifth Amendment. The court denied the motion and submitted the case to the jury. Petitioner was convicted on three of the five counts of the indictment and sentenced to concurrent 5-year terms on each count.
The Court of Appeals for the Tenth Circuit affirmed.
We granted certiorari,
II
A variance arises when the evidence adduced at trial establishes facts different from those alleged in an indictment.
Berger
v.
United States,
In our view, it is unnecessary to inquire, as did the Court of Appeals, whether petitioner was prejudiced by a variance
To uphold a conviction on a charge that was neither alleged in an indictment nor presented to a jury at trial offends the most basic notions of due process. New constitutional principles are more firmly established than a defendant’s right to be heard on the specific charges of which he is accused. See
Eaton
v.
Tulsa,
Ill
Congress enacted § 1623 as part of the 1970 Organized Crime Control Act, Pub. L. 91-452, 84 Stat. 922, to facilitate perjury prosecutions and thereby enhance the reliability of testimony before federal courts and grand juries. S. Rep. No. 91-617, pp. 58-59 (1969). Invoking this broad congressional purpose, the Government argues for an expansive construction of the term ancillary proceeding. Under the Government’s analysis, false swearing in an affidavit poses the same threat to the factfinding process as false testimony in open court. Brief for United States 21. Thus, the Government contends that any statements made under oath for submission to a court, whether given in an attorney’s office or in a local bar and grill, fall within the ambit of § 1623. See Tr. of Oral Arg. 31. In our judgment, the term “proceeding,” which carries a somewhat more formal connotation, suggests that Congress had a narrower end in view when enacting § 1623. And the legislative history of the Organized Crime Contol Act confirms that conclusion.
That Congress intended § 1623 to sweep less broadly than the perjury statute is also apparent from the origin of the term ancillary proceeding. As initially introduced in Congress, the Organized Crime Control Act contained a version of § 1623 which encompassed only inconsistent statements made in any “trial, hearing, or proceeding before any court or grand jury.” 8 When asked to comment on the proposed statute, the Department of Justice noted that the scope of the inconsistent declarations provision was “not as inclusive” as the perjury statute. See Hearings on S. 30 et al. before the Subcommittee on Criminal Laws and Procedures of the Senate Committee on the Judiciary, 91st Cong., 1st Sess., 372 (1969) (hereinafter S. 30 Hearings). Significantly, the Justice Department did not suggest that the provision be made coextensive with the perjury statute. However, in subsequent Senate Subcommittee hearings, Assistant Attorney General Wilson indicated, without elaboration, that the Department advocated “including [under § 1623] other testimony, preliminary testimony and other statements, in the perjury field.” Id., at 389.
In response to that general suggestion, Senator McClellan,
“You also read Title IV not to cover 'pre-trial depositions, affidavits and certifications.’ This was not our intent in drafting the bill. We had hoped that it would be applicable, for example, to situations such as [the] kind of pre-trial depositions that the enforcement of S. 1861 would present. If we included in the statute the phrase 'proceedings before or ancillary to any court or grand jury,’ do you feel that this intent would be adequately expressed?” Id., at 409. 9
The Government attaches great significance to the qualification, “for example,” in Senator McClellan’s letter. Because pretrial depositions were mentioned as illustrative, the Government interprets the term ancillary proceeding to subsume affidavits and certifications as well. But that is not the inference the Department of Justice originally drew from the Senator’s letter. Responding to the proposed modification of § 1623, Assistant Attorney General Wilson did not advert to affidavits or certifications but stated only that
“[inclusion of the phrase 'proceedings before or ancillary to any court or grand jury’ in the false statement provision would in our opinion adequately bring within the coverage of the provision pre-trial depositions such as that contained in S. 1861.” S. 30 Hearings 411.
In our view, the Justice Department’s contemporaneous rather than its current interpretation offers the more plausible reading of the Subcommittee’s intent. Its attention having been drawn to the issue, had the Subcommittee wished to bring all affidavits and certifications within the statutory
Finally, to construe the term ancillary proceeding in § 1623 as excluding statements given in less formal contexts than depositions would comport with Congress’ use of the phrase in a related provision of the Organized Crime Control Act. Title II of the Act, 18 U. S. C. § 6002, authorizes extension of immunity to any witness who claims his privilege against self-incrimination “in a proceeding . . . ancillary to” a court, grand jury, or agency of the United States, or before Congress or one of its committees. See n. 2, supra. Although neither the House nor Senate Report defines the precise scope of § 6002, they both specify pretrial depositions as the sole example of what would constitute an ancillary proceeding under that provision. H. R. Rep. No. 91-1549, p. 42 (1970); S. Rep. No. 91-617, p. 145 (1969).
Thus, both the language and history of the Act support the Court of Appeals’ conclusion that petitioner’s September 30 interview “lack[ed] the degree of formality” required by § 1623.
To characterize such an interview as an ancillary proceeding would not only take liberties with the language and legislative history of § 1623, it would also contravene this Court’s long-established practice of resolving questions concerning the ambit of a criminal statute in favor of lenity.
Huddleston
v.
United States,
We cannot conclude here that Congress in fact intended or clearly expressed an intent that § 1623 should encompass statements made in contexts less formal than a deposition. Accordingly, we hold that petitioner’s September 30 declarations were not given in a proceeding ancillary to a court or grand jury within the meaning of the statute. 14 The judgment of the Court of Appeals is
Reversed.
Notes
In pertinent part, 18 U. S. C. § 1623 (1976 ed., Supp. I) provides:
“(a) Whoever under oath (or in any declaration, certificate, verification, or statement under penalty of perjury as permitted under section 1746 of title 28, United States Code) in any proceeding before or ancillary to any court or grand jury of the United States knowingly makes any false material declaration or makes or uses any other information, including any book, paper, document, record, recording, or other material, knowing thesame to contain any false material declaration, shall be fined not more than $10,000 or imprisoned not more than five years, or both.
“(c) An indictment or information for violation of this section alleging that, in any proceedings before or ancillary to any court or grand jury of the United States, the defendant under oath has knowingly made two or more declarations, which are inconsistent to the degree that one of them is necessarily false, need not specify which declaration is false if—
“(1) each declaration was material to the point in question, and
“(2) each declaration was made within the period of the statute of limitations for the offense charged under this section.
“In any prosecution under this section, the falsity of a declaration set forth in the indictment or information shall be established sufficient for conviction by proof that the defendant while under oath made irreconcilably contradictory declarations material to the point in question in any proceeding before or ancillary to any court or grand jury. It shall be a defense to an indictment or information made pursuant to the first sentence of this subsection that the defendant at the time he made each declaration believed the declaration was true.”
Under 18 U. S. C. § 6002:
“Whenever a witness refuses, on the basis of his privilege against self-incrimination, to testify or provide other information in a proceeding before or ancillary to—
“(1) a court or grand jury of the United States,
“(2) an agency of the United States, or
“(3) either House of Congress, a joint committee of the two Houses, or a committee or a subcommittee of either House,
and the person presiding over the proceeding communicates to the witnessan order issued under this part, the witness may not refuse to comply with the order on the basis of his privilege against self-incrimination; but ho testimony or other information compelled under the order (or any information directly or indirectly derived from such testimony or other information) may be used against the witness in any criminal case, except a prosecution for perjury, giving a false statement, or otherwise failing to comply with the order.”
Each count alleged that a specific representation in the September 30 statement was inconsistent with a corresponding portion of petitioner’s grand jury testimony. See App. 3-11.
The District Court instructed the jury that in order to convict petitioner, it had to determine beyond a reasonable doubt that petitioner “while under oath, made irreconcilably contradictory declarations ... in any proceeding before or ancillary to a court or grand jury.” Tr. 179. The court did not define the term ancillary proceeding, but admonished the jury to render its verdict on the charges alleged in the indictment, which specified June 16, 1976, and September 30, 1976, as the proceedings at which inconsistent statements were given. Id., at 175-176; App. 3-11. Moreover, both the Assistant United States Attorney and defense counsel focused their summations on the September 30 statement. See Tr. 151, 167.
Title 18 U. S. C. § 1621 provides:
“Whoever—
“(1) having taken an oath before a competent tribunal, officer, or person, in any case in which a law of the United States authorizes an oath to be administered, that he will testify, declare, depose, or certify truly, or that any written testimony, declaration, deposition, or certificate by him subscribed, is true, willfully and contrary to such oath states or subscribes any material matter which he does not believe to be true; or
“(2) in any declaration, certificate, verification, or statement under penalty of perjury as permitted under section 1746 of title 28, United States Code, willfully subscribes as true any material matter which he does not believe to be true;
“is guilty of perjury and shall, except as otherwise expressly provided by law, be fined not more than $2,000 or imprisoned not more than five years, or both. This section is applicable whether the statement or subscription is made within or without the United States.”
In particular, Congress focused on the two-witness rule, under which “the uncorroborated oath of one witness is not enough to establish the falsity of the testimony of the accused.”
Hammer
v.
United States,
See id., at 110-111; n. 5, supra.
In its entirety, the original version of § 1623 (a) provided:
“Whoever, having taken an oath in any trial, hearing, or proceeding before any court or grand jury, in which a law of the United States authorizes the oath, knowingly falsifies fact, or makes any false, fictitious, or fraudulent statement or representation, or makes or uses any false writing or document knowing the same to contain any false, fictitious, or fraudulent statement or entry, shall be fined not more than $10,000 or imprisoned not more than five years, or both.” S. 30, 91st Cong., 1st Sess., § 401 (1969).
The provision of S. 1861 to which the Senator adverted involved use of depositions in racketeering investigations. It is currently codified as 18 U. S. C. § 1968.
In arguing that petitioner’s September 30 interview was an ancillary-proceeding, the Government relies on
United States
v.
Stassi,
Title 18 U. S. C. § 3503 (a) provides:
“Whenever due to exceptional circumstances it is in the interest of justice that the testimony of a prospective witness of a party be taken and preserved, the court at any time after the filing of an indictment or information may upon motion of such party and notice to the parties order that the testimony of such witness be taken by deposition . .. .”
The language of Fed. Rule Crim. Proc. 15 (a) is substantially the same.
See 18 U. S. C. §§3503 (b), (c); Fed. Rule Crim. Proc. 15 (b).
See App. 46; 18 U. S. C. §3503 (d); Fed. Rule Crim Proc. 15 (d).
The Government points out that if this Court reverses petitioner’s conviction on the ground that the September 30 statement was not given in an ancillary proceeding, petitioner will be subject to reindictment for making declarations in the October 21 hearing inconsistent with his testimony in the June 16 grand jury proceeding. Thus, the Government urges us to reach the second question decided by the Court of Appeals concerning the use of petitioner’s immunized testimony to prove a violation of § 1623. Brief for United States 36-37. We decline to render an advisory opinion based on the Government’s suppositions not only that petitioner will be reindicted but also that he will be convicted after a trial at which the immunized testimony is introduced.
