delivered the opinion of the Court.
In
Firestone Tire & Rubber Co.
v.
Risjord,
I
Petitioners are four police officers who formed a “grand-pop” decoy squad in the Philadelphia Police Department. Petitioner Flanagan would pose as an aged derelict, a likely target for street criminals. When Flanagan gave the standard alarm, the other members of the decoy team would move in to make an arrest.
*261 A federal grand jury in the Eastern District of Pennsylvania indicted petitioners in September 1981. The indictment alleged that petitioners had conspired to make arrests without probable cause and had unlawfully arrested and abused eight people. One count of the indictment charged petitioners with conspiring to deprive citizens of their civil rights in violation of 18 U. S. C. §241. The remaining 12 counts charged petitioners, in various combinations, with committing substantive civil rights offenses in violation of 18 U. S. C. §242.
Prior to the return of the indictment, petitioners had retained the law firm of Sprague and Rubenstone to act as joint counsel. Petitioners decided to continue the joint representation after the indictment was handed down, even though the indictment did not make the same allegations against all petitioners. Petitioners Keweshan, Landis, and McNamee, however, moved to sever their case from petitioner Flanagan’s, arguing that the Government’s evidence against Flanagan alone was so much greater than the evidence against them that severance was necessary to avoid prejudicial spillover. In addition, based on the asserted differences in their involvement in the activities alleged in the substantive counts of the indictment, petitioners moved to dismiss the conspiracy count. The Government responded by moving to disqualify Sprague and Rubenstone from its multiple representation of petitioners and by asking the court to inquire into the representation as required by Federal Rule of Criminal Procedure 44(c). 1
*262
In early December 1981, following a hearing and briefing on the Government’s motion, the District Court disqualified the law firm from participation in the case. The court found that no actual conflict of interest had yet developed but that there was a clear potential for conflict. Most notably, the severance motion and supporting papers showed that petitioner Flanagan’s interests were likely to diverge from the other petitioners’ interests. The District Court also found that petitioners had voluntarily, knowingly, and intelligently waived their right to conflict-free representation. The court concluded, however, that it had the authority and, indeed, the obligation under Rule 44(c) to disqualify counsel when “the likelihood is great that a potential conflict may escalate into an actual conflict.”
Petitioners appealed to the United States Court of Appeals for the Third Circuit, which affirmed the decision of the District Court in June 1982.
Petitioners filed their petition in September 1982, one year after the grand jury had returned the indictment against them. They contended that disqualification of counsel of their choice after they had knowingly waived conflict-free representation deprived them of their Sixth Amendment right to assistance of counsel and of their Fifth Amendment
*263
due process right to present a common defense through joint counsel. We granted certiorari in January 1983.
HH HH
“Finality as a condition of review is an historic characteristic of federal appellate procedure.”
Cobbledick
v.
United States,
The final judgment rule serves several important interests. It helps preserve the respect due trial judges by minimizing
*264
appellate-court interference with the numerous decisions they must make in the prejudgment stages of litigation. It reduces the ability of litigants to harass opponents and to clog the courts through a succession of costly and time-consuming appeals. It is crucial to the efficient administration of justice.
Firestone Tire & Rubber Co.
v.
Risjord, supra,
at 374. For these reasons, “[t]his Court has long held that the policy of Congress embodied in [§ 1291] is inimical to piecemeal appellate review of trial court decisions which do not terminate the litigation . . . .”
United States
v.
Hollywood Motor Car Co.,
The Court has also long held that “this policy is at its strongest in the field of criminal law.” Ibid. More than 40 years ago the Court noted that the reasons for the final judgment rule are “especially compelling in the administration of criminal justice.” Cobbledick v. United States, supra, at 325. Promptness in bringing a criminal case to trial has become increasingly important as crime has increased, court dockets have swelled, and detention facilities have become overcrowded.
As the Sixth Amendment’s guarantee of a speedy trial indicates, the accused may have a strong interest in speedy resolution of the charges against him. In addition, “there is a societal interest in providing a speedy trial which exists separate from, and at times in opposition to, the interests of the accused.”
Barker
v.
Wingo,
The importance of the final judgment rule has led the Court to permit departures from the rule “only when observance of it would practically defeat the right to any review at all.”
Cobbledick
v.
United States, supra,
at 324-325 (footnote omitted). The Court has allowed a departure only for the “limited category of cases falling within the ‘collateral order’ exception delineated in Cohen. ...”
United States
v.
Hollywood Motor Car Co., supra,
at 265.
3
To come within this “narrow exception,”
Firestone Tire & Rubber Co.
v.
Risjord, supra,
at 374, a trial court order must, at a minimum, meet three conditions. First, it “must conclusively determine the disputed question”; second, it must “resolve an important issue completely separate from the merits of the action”; third, it must “be effectively unreviewable on appeal from a final judgment.”
Coopers & Lybrand
v.
Livesay,
Because of the compelling interest in prompt trials, the Court has interpreted the requirements of the collateral-order exception to the final judgment rule with the utmost strictness in criminal cases. The Court has found only three types of pretrial orders in criminal prosecutions to meet the
*266
requirements. See
United States
v.
Hollywood Motor Car Co.,
An order denying a motion to reduce bail may be reviewed before trial. The issue is finally resolved and is independent of the issues to be tried, and the order becomes moot if review awaits conviction and sentence.
Stack
v.
Boyle,
An order disqualifying counsel lacks the critical characteristics that make orders denying bail reduction or refusing to dismiss on double jeopardy or speech or debate grounds immediately appealable. Unlike a request for bail reduction, a constitutional objection to counsel’s disqualification is in no danger of becoming moot upon conviction and sentence. Moreover, it cannot be said that the right petitioners assert, whether based on the Due Process Clause of the Fifth
*267
Amendment or on the Assistance of Counsel Clause of the Sixth Amendment, is a right not to be tried. Double jeopardy and speech or debate rights are
sui generis
in this regard. See
United States
v.
MacDonald,
A disqualification order thus is not analogous to any of the three types of interlocutory orders that this Court has found immediately appealable in criminal cases. Accordingly, Stack, Abney, and Helstoski provide no authority for petitioners’ assertion that a disqualification order satisfies the three necessary conditions for coverage by the collateral-order exception. Nor does petitioners’ jurisdictional assertion gain support from a direct inquiry into whether a disqualification order satisfies the three Coopers & Lybrand conditions. This is so regardless of the nature of the right to joint representation claimed by petitioners. 4
Petitioners correctly concede that postconviction review of a disqualification order is fully effective to the extent that the asserted right to counsel of one’s choice is like, for example,
*268
the Sixth Amendment right to represent oneself. See
Faretta
v.
California,
If, on the other hand, petitioners’ asserted right is one that is not violated absent some specifically demonstrated prejudice to the defense, a disqualification order still falls outside the coverage of the collateral-order exception. We need not consider, however, whether the third Coopers & Lybrand condition is satisfied — that is, whether postconviction review is plainly ineffective. It is sufficient to note that the second Coopers & Lybrand condition — that the order be truly collateral — is not satisfied if petitioners’ asserted right is one requiring prejudice to the defense for its violation.
On this assumption, a disqualification order, though final, is not independent of the issues to be tried. Its validity cannot be adequately reviewed until trial is complete. The effect of the disqualification on the defense, and hence whether the asserted right has been violated, cannot be fairly as *269 sessed until the substance of the prosecution’s and defendant’s cases is known. In this respect the right claimed by petitioners is analogous to the speedy trial right. In United States v. MacDonald, supra, at 859, 860, the Court concluded that because impairment of the defense is an important factor in judging whether a speedy trial violation has occurred, a denial of a motion to dismiss on speedy trial grounds is not separable from the issues at trial. The same conclusion applies to a disqualification order if prejudice to the defense is a necessary element of petitioners’ claim. In these circumstances, the second Coopers & Lybrand condition for immediate appealability as a collateral order is not satisfied: the disqualification order does not resolve an “issue completely separate from the merits of the action.” See supra, at 265.
In short, whether or not petitioners’ claim requires a showing of prejudice, a disqualification order does not qualify as an immediately appealable collateral order in a straightforward application of the necessary conditions laid down in prior cases. Further, petitioners’ claim does not justify expanding the small class of criminal case orders covered by the collateral-order exception to the final judgment rule — either by eliminating any of the Coopers & Lybrand conditions or by interpreting them less strictly than the Court’s cases have done. The costs of such expansion are great, and the potential rewards are small.
Unlike an appeal of a bail decision, see
Stack
v.
Boyle,
Ill
“
‘[T]he final judgment rule is the dominant rule in federal appellate practice.’ 6 Moore, Federal Practice (2d ed. 1953), 113. Particularly is this true of criminal prosecutions.”
DiBella
v.
United States,
The judgment of the Court of Appeals is accordingly reversed. On remand the appeal should be dismissed.
It is so ordered.
Notes
Federal Rule of Criminal Procedure 44(c) provides:
“Whenever two or more defendants have been jointly charged ... or have been joined for trial . . . , and are represented by the same retained or assigned counsel or by retained or assigned counsel who are associated in the practice of law, the court shall promptly inquire with respect to such joint representation and shall personally advise each defendant of his right to the effective assistance of counsel, including separate representation. Unless it appears that there is good cause to believe no conflict of interest is likely to arise, the court shall take such measures as may be appropriate to protect each defendant’s right to counsel.”
Among the Courts of Appeals, six Circuits in addition to the Third Circuit have allowed immediate appeal of pretrial disqualifications of criminal defense counsel.
United States
v.
Curcio,
Title 18 U. S. C. § 3731 provides a statutory exception to the final judgment rule for certain orders suppressing or excluding evidence. That provision is not at issue in this case, which concerns only the finality requirement of 28 U. S. C. § 1291. This case likewise does not involve the finality problems that arise in appeals from state-court decisions to this Court under 28 U. S. C. § 1257. See
Cox Broadcasting Corp.
v.
Cohn,
We need not and do not express any view on the nature or existence of that right.
