Justice Stevens
delivered the opinion of the Court.
This case presents a question of statutory construction: whether 42 U. S. C. §1983 (1976 ed., Supp. V) authorizes a convicted person to assert a claim for damages against a police officer for giving perjured testimony at his criminal trial. The Court of Appeals for the Seventh Circuit held that witnesses are absolutely immune from damages liability based on their testimony, and rejected the petitioners’ contention that government officials who testify about the performance of their official duties may be held liable under § 1983 even if other witnesses may not. We agree with that conclusion.
The Court of Appeals heard argument in three separate cases raising the absolute immunity issue and decided them in a single opinion. Two of these cases are before us on a writ of certiorari. Petitioner Briscoe was convicted in state court of burglarizing a house trailer. He then filed a § 1983 complaint against respondent LaHue, a member of the Bloo-mington, Indiana, police force, alleging that LaHue had violated his constitutional right to due process by committing perjury in the criminal proceedings leading to his conviction.1 [327]*327LaHue had testified that in his opinion Briscoe was one of no more than 50 to 100 people in Bloomington whose prints would match a partial thumbprint on a piece of glass found at the scene of the crime. According to Briscoe, the testimony was false because the Federal Bureau of Investigation and the state police considered the partial print too incomplete to be of value, and without the print there was no evidence identifying him as the burglar. He sought $100,000 in damages. The District Court granted LaHue’s motion for summary judgment on four separate grounds: (1) the facts alleged in the complaint did not suggest that LaHue had testified falsely; (2) allegations of perjury alone are insufficient to state a constitutional claim; (3) LaHue had not testified “under color of law”; and (4) Briscoe’s claim was collaterally estopped by his criminal conviction.
Petitioners Vickers and Ballard were jointly tried and convicted of sexual assault in state court. They subsequently brought a civil action under § 1983 against respondent Hun-ley, a member of the Cedar Lake, Indiana, police force, alleging that he had deprived them of their constitutional rights to due process and a fair trial. They alleged that, by giving false testimony suggesting that they had been able to harmonize their stories before making exculpatory statements to police, he had prejudicially diminished the credibility of those statements. Each plaintiff sought $150,000 in compensatory and $50,000 in punitive damages. The Federal Magistrate granted a motion to dismiss the complaint on alternative grounds: (1) Hunley had not testified “under color of law”; (2) he was entitled to absolute witness immunity; and (3) peti- - tioners had failed to state a claim under § 1983 because they did not allege that the prosecutor had knowingly used false testimony. The District Court affirmed the dismissal on the first ground. Both cases were appealed to the United States Court of Appeals for the Seventh Circuit.2
[328]*328Although other issues were argued in the Court of Appeals, its holding in both cases was predicated squarely on the ground that, in litigation brought under 42 U. S. C. §1983 (1976 ed., Supp. V), all witnesses — police officers as well as lay witnesses — are absolutely immune from civil liability based on their testimony in judicial proceedings. 663 F. 2d 713 (1981).3 Because of the importance of the immunity question, which has given rise to divergent conclusions in the Courts of Appeals,4 we granted certiorari. 455 U. S. 1016 (1982).5
[329]*329Before confronting the precise question that this case presents — whether § 1983 creates a damages remedy against police officers for their testimony as witnesses — we begin by considering the potential liability of lay witnesses on the one hand, and of judges and prosecutors who perform integral functions in judicial proceedings on the other hand. The unavailability of a damages remedy against both of these categories sheds considerable light on petitioners’ claim that Congress intended police officer witnesses to be treated differently.
I
There are two reasons why § 1983 does not allow recovery of damages against a private party for testimony in a judicial proceeding. First, § 1983 does not create a remedy for all conduct that may result in violation of “rights, privileges, or immunities secured by the Constitution and laws.” Its reach is limited to actions taken “under color of any statute, ordinance, regulation, custom, or usage, of any State or Territory . . . .”6 It is beyond question that, when a private [330]*330party gives testimony in open court in a criminal trial, that act is not performed “under color of law.”7
Second, since 1951, when this Court decided Tenney v. Brandhove, 341 U. S. 367, it has been settled that the all-encompassing language of § 1983, referring to “[e]very person” who, under color of law, deprives another of federal constitutional or statutory rights, is not to be taken literally.8
“It is by now well settled that the tort liability created by § 1983 cannot be understood in a historical vacuum. . . . One important assumption underlying the Court’s decisions in this area is that members of the 42d Congress were familiar with common-law principles, including defenses previously recognized in ordinary tort litigation, and that they likely intended these common-law principles to obtain, absent specific provisions to the contrary.” City of Newport v. Fact Concerts, Inc., 453 U. S. 247, 258 (1981).
See Pierson v. Ray, 386 U. S. 547, 554 (1967).
The immunity of parties and witnesses from subsequent damages liability for their testimony in judicial proceedings9 [331]*331was well established in English common law. Cutler v. Dixon, 4 Co. Rep. 14b, 76 Eng. Rep. 886 (Q. B. 1585); Anfield v. Feverhill, 2 Bulst. 269, 80 Eng. Rep. 1113 (K. B. 1614); Henderson v. Broomhead, 4 H. & N. 569, 578, 157 Eng. Rep. 964, 968 (Ex. 1859);10 see Dawkins v. Lord Rokeby, 4 F. & F. 806, 833-834, 176 Eng. Rep. 800, 812 (C. P. 1866). Some American decisions required a showing that the witness’ allegedly defamatory statements were relevant to the judicial proceeding, but once this threshold showing had been made, the witness had an absolute privilege.11 The [332]*332plaintiff could not recover even if the witness knew the statements were false and made them with malice.12
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Justice Stevens
delivered the opinion of the Court.
This case presents a question of statutory construction: whether 42 U. S. C. §1983 (1976 ed., Supp. V) authorizes a convicted person to assert a claim for damages against a police officer for giving perjured testimony at his criminal trial. The Court of Appeals for the Seventh Circuit held that witnesses are absolutely immune from damages liability based on their testimony, and rejected the petitioners’ contention that government officials who testify about the performance of their official duties may be held liable under § 1983 even if other witnesses may not. We agree with that conclusion.
The Court of Appeals heard argument in three separate cases raising the absolute immunity issue and decided them in a single opinion. Two of these cases are before us on a writ of certiorari. Petitioner Briscoe was convicted in state court of burglarizing a house trailer. He then filed a § 1983 complaint against respondent LaHue, a member of the Bloo-mington, Indiana, police force, alleging that LaHue had violated his constitutional right to due process by committing perjury in the criminal proceedings leading to his conviction.1 [327]*327LaHue had testified that in his opinion Briscoe was one of no more than 50 to 100 people in Bloomington whose prints would match a partial thumbprint on a piece of glass found at the scene of the crime. According to Briscoe, the testimony was false because the Federal Bureau of Investigation and the state police considered the partial print too incomplete to be of value, and without the print there was no evidence identifying him as the burglar. He sought $100,000 in damages. The District Court granted LaHue’s motion for summary judgment on four separate grounds: (1) the facts alleged in the complaint did not suggest that LaHue had testified falsely; (2) allegations of perjury alone are insufficient to state a constitutional claim; (3) LaHue had not testified “under color of law”; and (4) Briscoe’s claim was collaterally estopped by his criminal conviction.
Petitioners Vickers and Ballard were jointly tried and convicted of sexual assault in state court. They subsequently brought a civil action under § 1983 against respondent Hun-ley, a member of the Cedar Lake, Indiana, police force, alleging that he had deprived them of their constitutional rights to due process and a fair trial. They alleged that, by giving false testimony suggesting that they had been able to harmonize their stories before making exculpatory statements to police, he had prejudicially diminished the credibility of those statements. Each plaintiff sought $150,000 in compensatory and $50,000 in punitive damages. The Federal Magistrate granted a motion to dismiss the complaint on alternative grounds: (1) Hunley had not testified “under color of law”; (2) he was entitled to absolute witness immunity; and (3) peti- - tioners had failed to state a claim under § 1983 because they did not allege that the prosecutor had knowingly used false testimony. The District Court affirmed the dismissal on the first ground. Both cases were appealed to the United States Court of Appeals for the Seventh Circuit.2
[328]*328Although other issues were argued in the Court of Appeals, its holding in both cases was predicated squarely on the ground that, in litigation brought under 42 U. S. C. §1983 (1976 ed., Supp. V), all witnesses — police officers as well as lay witnesses — are absolutely immune from civil liability based on their testimony in judicial proceedings. 663 F. 2d 713 (1981).3 Because of the importance of the immunity question, which has given rise to divergent conclusions in the Courts of Appeals,4 we granted certiorari. 455 U. S. 1016 (1982).5
[329]*329Before confronting the precise question that this case presents — whether § 1983 creates a damages remedy against police officers for their testimony as witnesses — we begin by considering the potential liability of lay witnesses on the one hand, and of judges and prosecutors who perform integral functions in judicial proceedings on the other hand. The unavailability of a damages remedy against both of these categories sheds considerable light on petitioners’ claim that Congress intended police officer witnesses to be treated differently.
I
There are two reasons why § 1983 does not allow recovery of damages against a private party for testimony in a judicial proceeding. First, § 1983 does not create a remedy for all conduct that may result in violation of “rights, privileges, or immunities secured by the Constitution and laws.” Its reach is limited to actions taken “under color of any statute, ordinance, regulation, custom, or usage, of any State or Territory . . . .”6 It is beyond question that, when a private [330]*330party gives testimony in open court in a criminal trial, that act is not performed “under color of law.”7
Second, since 1951, when this Court decided Tenney v. Brandhove, 341 U. S. 367, it has been settled that the all-encompassing language of § 1983, referring to “[e]very person” who, under color of law, deprives another of federal constitutional or statutory rights, is not to be taken literally.8
“It is by now well settled that the tort liability created by § 1983 cannot be understood in a historical vacuum. . . . One important assumption underlying the Court’s decisions in this area is that members of the 42d Congress were familiar with common-law principles, including defenses previously recognized in ordinary tort litigation, and that they likely intended these common-law principles to obtain, absent specific provisions to the contrary.” City of Newport v. Fact Concerts, Inc., 453 U. S. 247, 258 (1981).
See Pierson v. Ray, 386 U. S. 547, 554 (1967).
The immunity of parties and witnesses from subsequent damages liability for their testimony in judicial proceedings9 [331]*331was well established in English common law. Cutler v. Dixon, 4 Co. Rep. 14b, 76 Eng. Rep. 886 (Q. B. 1585); Anfield v. Feverhill, 2 Bulst. 269, 80 Eng. Rep. 1113 (K. B. 1614); Henderson v. Broomhead, 4 H. & N. 569, 578, 157 Eng. Rep. 964, 968 (Ex. 1859);10 see Dawkins v. Lord Rokeby, 4 F. & F. 806, 833-834, 176 Eng. Rep. 800, 812 (C. P. 1866). Some American decisions required a showing that the witness’ allegedly defamatory statements were relevant to the judicial proceeding, but once this threshold showing had been made, the witness had an absolute privilege.11 The [332]*332plaintiff could not recover even if the witness knew the statements were false and made them with malice.12
In the words of one 19th-century court, in damages suits against witnesses, “the claims of the individual must yield to [333]*333the dictates of public policy, which requires that the paths which lead to the ascertainment of truth should be left as free and unobstructed as possible.” Calkins v. Sumner, 13 Wis. 193, 197 (1860). A witness’ apprehension of subsequent damages liability might induce two forms of self-censorship. First, witnesses might be reluctant to come forward to testify. See Henderson v. Broomhead, supra, at 578-579, 157 Eng. Rep., at 968. And once a witness is on the stand, his testimony might be distorted by the fear of subsequent liability. See Barnes v. McCrate, 32 Me. 442, 446-447 (1851). Even within the constraints of the witness’ oath there may be various ways to give an account or to state an opinion. These alternatives may be more or less detailed and may differ in emphasis and certainty. A witness who knows that he might be forced to defend a subsequent lawsuit, and perhaps to pay damages, might be inclined to shade his testimony in favor of the potential plaintiff, to magnify uncertainties, and thus to deprive the finder of fact of candid, objective, and undistorted evidence. See Veeder, Absolute Immunity in Defamation: Judicial Proceedings, 9 Colum. L. Rev. 463, 470 (1909).13 But the truthfinding process is better [334]*334served if the witness’ testimony is submitted to “the crucible of the judicial process so that the factfinder may consider it, after cross-examination, together with the other evidence in the case to determine where the truth lies.” Imbler v. Pachtman, 424 U. S. 409, 440 (1976) (White, J., concurring in judgment).14
At least with respect to private witnesses, it is clear that §1983 did not abrogate the absolute immunity existing at common law, and petitioners do not contend otherwise. Like the immunity for legislators at issue in Tenney v. Brandhove, the common law’s protection for witnesses is “a tradition so well grounded in history and reason” that we cannot believe that Congress impinged on it “by covert inclusion in the general language before us.” 341 U. S., at 376.
II
The Court has already addressed the question whether § 1983 permits damages recoveries from judges, prosecutors, and other persons acting “under color of law” who perform official functions in the judicial process. Again, we have found that, in light of common-law immunity principles, § 1983 did not impose liability on these officials. We have held that state judges are absolutely immune from liability for their judicial acts, Pierson v. Ray, 386 U. S. 547 (1967); Stump v. Sparkman, 435 U. S. 349 (1978), and that state prosecutors have absolute immunity from liability for their actions in initiating prosecutions, Imbler v. Pachtman, supra.
The central focus of our analysis has been the nature of the judicial proceeding itself. Thus, in his opinion concurring in the judgment in Imbler v. Pachtman, supra, Justice White explained that the absolute immunity of public prosecutors was “based on the policy of protecting the judicial process.” [335]*335424 U. S., at 439. He explained that this protection extended equally to other participants, including counsel and witnesses.
“The reasons for this rule are also substantial. It is precisely the function of a judicial proceeding to determine where the truth lies. The ability of courts, under carefully developed procedures, to separate truth from falsity, and the importance of accurately resolving factual disputes in criminal (and civil) cases are such that those involved in judicial proceedings should be ‘given every encouragement to make a full disclosure of all pertinent information within their knowledge.’” Ibid.
The common law’s protection for judges and prosecutors formed part of a “cluster of immunities protecting the various participants in judge-supervised trials,” which stemmed “from the characteristics of the judicial process.” Butz v. Economou, 438 U. S. 478, 512 (1978); cf. King v. Skinner, Lofft 54, 56, 98 Eng. Rep. 529 (K. B. 1772) (“[NJeither party, witness, counsel, jury, or judge can be put to answer, civilly or criminally, for words spoken in office”). The common law recognized that
“controversies sufficiently intense to erupt in litigation are not easily capped by a judicial decree. The loser in one forum will frequently seek another .... Absolute immunity is thus necessary to assure that judges, advocates, and witnesses can perform their respective functions without harassment or intimidation.” Butz, supra, at 512.
In short, the common law provided absolute immunity from subsequent damages liability for all persons — governmental or otherwise — who were integral parts of the judicial process. It is equally clear that § 1983 does not authorize a damages claim against private witnesses on the one hand, or against judges or prosecutors in the performance of their respective duties on the other. When a police officer appears as a witness, he may reasonably be viewed as acting like any [336]*336other witness sworn to tell the truth — in which event he can make a strong claim to witness immunity;16 alternatively, he may be regarded as an official performing a critical role in the judicial process, in which event he may seek the benefit afforded to other governmental participants in the same proceeding. Nothing in the language of the statute suggests that such a witness belongs in a narrow, special category lacking protection against damages suits. We must ask, however, whether anything in the legislative history of § 1983 points to a different conclusion.
I — I HH h-H
Petitioners point to a number of references throughout the debates on the 1871 Act to widespread perjury by Ku Klux Klan witnesses in state criminal trials.15 They urge that, because perjury was one of the specific evils with which Congress was concerned, recognizing an absolute immunity for witnesses would conflict with congressional intent. We find this argument unpersuasive. The Act consisted of several sections establishing different remedies for disorder and violence in the Southern States.17 The legislative history and statutory language indicate that Congress intended perjury [337]*337leading to unjust acquittals of Klan conspirators to be prohibited by §2, the civil and criminal conspiracy section of the statute, now codified in relevant part at 42 U. S. C. § 1985(3) (1976 ed., Supp. V) and 18 U. S. C. §241. But the language of §1 — now codified as §1983 — differs from that of §2 in essential respects, and we find no evidence that Congress intended to abrogate the traditional common-law witness immunity in §1983 actions.
The Ku Klux Act, 17 Stat. 13, was enacted on April 20, 1871, less than a month after President Grant sent a dramatic message to Congress describing the breakdown of law and order in the Southern States. Cong. Globe, 42d Cong., 1st Sess., 236, 244 (1871). During the debates, supporters of the bill repeatedly described the reign of terror imposed by the Klan upon black citizens and their white sympathizers in the Southern States. Hours of oratory were devoted to the details of Klan outrages — arson, robbery, whippings, shootings, murders, and other forms of violence and intimidation— often committed in disguise and under cover of night. These acts of lawlessness went unpunished, legislators asserted, because Klan members and sympathizers controlled or influenced the administration of state criminal justice. In particular, it was alleged that Klan members were obligated, by virtue of membership in the organization, to protect fellow members who were charged with criminal activity. They had a duty to offer themselves for service on grand and petit juries, and to violate their jurors’ oaths by refusing to indict or to convict regardless of the strength of the evidence. They also were bound to appear as witnesses, and again to violate their oaths by committing perjury, if necessary, to exculpate their Klan colleagues.18 Perjury was thus one of the [338]*338means by which the Klan prevented state courts from gaining convictions of Klan members for crimes against blacks and Republicans.
It is clear from the legislative debates that, in the view of the Act’s sponsors, the victims of Klan outrages were deprived of “equal protection of the laws” if the perpetrators systematically went unpunished.19 Proponents of the measure repeatedly argued that, given the ineffectiveness of state law enforcement and the individual’s federal right to “equal protection of the laws,” an independent federal remedy was necessary and Congress had the power to provide it.20 See Monroe v. Pape, 365 U. S. 167, 174 (1961).
Section 2 was designed specifically to provide criminal and civil remedies in federal court for the conspiratorial activities of the Klan. Indeed the provision singles out those who “go in disguise upon the public highway.” Earlier versions of the section enumerated precisely the activities that had been attributed to the Klan — murder, manslaughter, mayhem, robbery, assault and battery, perjury, subornation of perjury, criminal obstruction of legal process or resistance of of-[339]*339fleers in discharge of official duty, arson, or larceny. Cong. Globe, supra, at 317. The more general language in the final version of § 2 was also intended to apply to the abuses that had been described repeatedly in congressional debate.21 Part of the provision is particularly well tailored to reach conspiracies to commit perjury in order to prevent punishment of fellow Klansmen. It provides penalties whenever two or more persons shall
“conspire together ... for the purpose of preventing or hindering the constituted authorities of any State from giving or securing to all persons within such State the equal protection of the laws, or shall conspire together for the purpose of in any manner impeding, hindering, obstructing, or defeating the due course of justice in any State or Territory, with intent to deny to any citizen of the United States the due and equal protection of the laws . . . ,”22
This evidence does not, however, tend to show that Congress intended to abrogate witness immunity in civil actions under § 1, which applied to wrongs committed “under color of . . . law.” The bill’s proponents were exclusively concerned with perjury resulting in unjust acquittals — perjury likely to be committed by private parties acting in furtherance of a conspiracy — and not with perjury committed “under color of [340]*340law” that might lead to unjust convictions. In hundreds of pages of debate there is no reference to the type of alleged constitutional deprivation at issue in this case: perjury by a government official leading to an unjust conviction. Indeed, the legislative history is virtually silent even with regard to perjury by private persons leading to convictions of innocent defendants.23 There is a simple enough reason for this lacuna: the Klan had other, more direct, means of dealing with its victims. A “reign of terrorism and bloodshed” did not require the formal processes of law; at most, drumhead tribunals were convened at dead of night.24 Even when the organization’s intended victims had been taken into custody and charged with crimes, the evidence before Congress suggested that the Klan resorted to vigilante justice rather than courtroom perjury.25
In summary, the legislative history supports criminal punishment under §2 for a witness who conspired to give perjured testimony favorable to a defendant, with the effect of preventing effective enforcement of the laws, and liability in a civil suit against the perjured witness by the defendant’s victim. But these are not the issues before us today. We are asked to extrapolate from pro-defendant perjury to pro-prosecution perjury, and if willing to make that step, we are further invited to apply legislative history relating to § 2 — a section specifically directed toward private conspiracies — to § 1 — a section designed to provide remedies for abuses under [341]*341color of law. We decline the invitation. The debates of the 42d Congress do not support petitioners’ contention that Congress intended to provide a § 1 damages remedy against police officers or any other witnesses.26
I — I C
Petitioners, finally, urge that we should carve out an exception to the general rule of immunity in cases of alleged perjury by police officer witnesses.27 They assert that the reasons supporting common-law immunity — the need to [342]*342avoid intimidation and self-censorship — apply with diminished force to police officers. Policemen often have a duty to testify about the products of their investigations, and they have a professional interest in obtaining convictions which would assertedly counterbalance any tendency to shade testimony in favor of potentially vindictive defendants. In addition, they are subject to § 1983 lawsuits for the performance of their other duties, as to which they have only qualified immunity, and their defense is generally undertaken by their governmental employers. Further, petitioners urge that perjured testimony by police officers is likely to be more damaging to constitutional rights than such testimony by ordinary citizens, because the policeman in uniform carries special credibility in the eyes of jurors. And, in the case of police officers, who cooperate regularly with prosecutors in the enforcement of criminal law, prosecution for perjury is alleged to be so unlikely that it is not an effective substitute for civil damages.
These contentions have some force. But our cases clearly indicate that immunity analysis rests on functional categories, not on the status of the defendant.28 A police officer on the witness stand performs the same functions as any other witness; he is subject to compulsory process, takes an oath, responds to questions on direct examination and cross-examination, and may be prosecuted subsequently for perjury.
Moreover, to the extent that traditional reasons for witness immunity are less applicable to governmental witnesses, [343]*343other considerations of public policy support absolute immunity more emphatically for such persons than for ordinary witnesses. Subjecting government officials, such as police officers, to damages liability under § 1983 for their testimony might undermine not only their contribution to the judicial process but also the effective performance of their other public duties.
Section 1983 lawsuits against police officer witnesses, like lawsuits against prosecutors, “could be expected with some frequency.” Cf. Imbler v. Pachtman, 424 U. S., at 425. Police officers testify in scores of cases every year, and defendants often will transform resentment at being convicted into allegations of perjury by the State’s official witnesses. As the files in this case show, even the processing of a complaint that is dismissed before trial consumes a considerable amount of time and resources.29
This category of § 1983 litigation might well impose significant burdens on the judicial system and on law enforcement resources. As this Court noted when it recognized absolute immunity for prosecutors in Imbler, if the defendant official “could be made to answer in court each time [a disgruntled defendant] charged him with wrongdoing, his energy and at[344]*344tention would be diverted from the pressing duty of enforcing the criminal law.” 424 U. S., at 425. To some degree the individual’s burden might be alleviated by the government’s provision of counsel, but a case that goes to trial always imposes significant emotional and other costs on every party litigant.
It is not sufficient to assert that the burdens on defendants and the courts could be alleviated by limiting the cause of action to those former criminal defendants who have already vindicated themselves in another forum, either on appeal or by collateral attack. We rejected a similar contention in Imbler. Petitioner contended that “his suit should be allowed, even if others would not be, because the District Court’s issuance of the writ of habeas corpus shows that his suit has substance.” Id., at 428, n. 27. We declined to carve out such an exception to prosecutorial immunity, noting that petitioner’s success in a collateral proceeding did not necessarily establish the merits of his civil rights action. Moreover, we noted that “using the habeas proceeding as a ‘door-opener’ for a subsequent civil rights action would create the risk of injecting extraneous concerns into that proceeding.” Ibid. We emphasized that, in determining whether to grant postconviction relief, the tribunal should focus solely on whether there was a fair trial under law. “This focus should not be blurred by even the subconscious knowledge that a post-trial decision in favor of the accused might result in the prosecutor’s being called upon to respond in damages for his error or mistaken judgment.” Id., at 427. The same danger exists in the case of potential liability for police officer witnesses.30
[345]*345There is, of course, the possibility that, despite the truth-finding safeguards of the judicial process, some defendants might indeed be unjustly convicted on the basis of knowingly false testimony by police officers.31 The absolute immunity for prosecutors recognized in Imbler bars one possible avenue of redress for such defendants. Similarly, in this case, the absolute witness immunity bars another possible path to recovery for these defendants. But we have recognized, again and again, that in some situations, the alternative of limiting the official’s immunity would disserve the broader public interest. As Judge Learned Hand wrote years ago:
“As is so often the case, the answer must be found in a balance between the evils inevitable in either alternative. In this instance it has been thought in the end better to leave unredressed the wrongs done by dishonest officers than to subject those who try to do their duty to the constant dread of retaliation.” Gregoire v. Biddle, 177 F. 2d 579, 581 (CA2 1949), cert. denied, 339 U. S. 949 (1950).32
In short, the rationale of our prior absolute immunity cases governs the disposition of this case. In 1871, common-law immunity for witnesses was well settled. The principles set forth in Pierson v. Ray to protect judges and in Imbler v. Pachtman to protect prosecutors also apply to witnesses, who perform a somewhat different function in the trial process but whose participation in bringing the litigation to a [346]*346just — or possibly unjust — conclusion is equally indispensable. The decision of the Court of Appeals is affirmed.
It is so ordered.