Justice Powell
delivered the opinion of the Court.
The question presented is whether a passive enforcement policy under which the Government prosecutes only those who report themselves as having violated the law, or who are reported by others, violates the First and Fifth Amendments.
I — I
On July 2, 1980, pursuant to his authority under § 3 of the Military Selective Service Act, 62 Stat. 605, as amended, 50 U. S. C. App. §453,1 the President issued Presidential Proc[601]*601lamation No. 4771, 3 CFR 82 (1981). This Proclamation directed male citizens and certain male residents born during 1960 to register with the Selective Service System during the week of July 21, 1980. Petitioner fell within that class but did not register. Instead, he wrote several letters to Government officials, including the President, stating that he had not registered and did not intend to do so.2
Petitioner’s letters were added to a Selective Service file of young men who advised that they had failed to register or who were reported by others as having failed to register. For reasons we discuss, infra, at 612-613, Selective Service adopted a policy of passive enforcement under which it would investigate and prosecute only the cases of nonregistration contained in this file. In furtherance of this policy, Selective Service sent a letter on June 17, 1981, to each reported violator who had not registered and for whom it had an address. [602]*602The letter explained the duty to register, stated that Selective Service had information that the person was required to register but had not done so, requested that he either comply with the law by filling out an enclosed registration card or explain why he was not subject to registration, and warned that a violation could result in criminal prosecution and specified penalties. Petitioner received a copy of this letter but did not respond.
On July 20, 1981, Selective Service transmitted to the Department of Justice, for investigation and potential prosecution, the names of petitioner and 133 other young men identified under its passive enforcement system — all of whom had not registered in response to the Service’s June letter. At two later dates, it referred the names of 152 more young men similarly identified. After screening out the names of those who appeared not to be in the class required to register, the Department of Justice referred the remaining names to the Federal Bureau of Investigation for additional inquiry and to the United States Attorneys for the districts in which the nonregistrants resided. Petitioner’s name was one of those referred.
Pursuant to Department of Justice policy, those referred were not immediately prosecuted. Instead, the appropriate United States Attorney was required to notify identified non-registrants by registered mail that, unless they registered within a specified time, prosecution would be considered. In addition, an FBI agent was usually sent to interview the nonregistrant before prosecution was instituted. This effort to persuade nonregistrants to change their minds became known as the “beg” policy. Under it, young men who registered late were not prosecuted, while those who never registered were investigated further by the Government. Pursuant to the “beg” policy, the United States Attorney for the Central District of California sent petitioner a letter on October 15, 1981, urging him to register or face possible prosecution. Again petitioner failed to respond.
[603]*603On December 9, 1981, the Department of Justice instructed all United States Attorneys not to begin seeking indictments against nonregistrants until further notice. On January 7, 1982, the President announced a grace period to afford nonregistrants a further opportunity to register without penalty. This grace period extended until February 28, 1982. Petitioner still did not register.
Over the next few months, the Department decided to begin prosecuting those young men who, despite the grace period and “beg” policy, continued to refuse to register. It recognized that under the passive enforcement system those prosecuted were “liable to be vocal proponents of non-registration” or persons “with religious or moral objections.” Memorandum of March 17, 1982, from Lawrence Lippe, Chief, General Litigation and Legal Advice Section, Criminal Division, Department of Justice, to D. Lowell Jensen, Assistant Attorney General, Criminal Division, App. 301. It also recognized that prosecutions would “undoubtedly result in allegations that the [case was] brought in retribution for the nonregistrant’s exercise of his first amendment rights.” Ibid. The Department was advised, however, that Selective Service could not develop a more “active” enforcement system for quite some time. See infra, at 613. Because of this, the Department decided to begin seeking indictments under the passive system without further delay. On May 21, 1982, United States Attorneys were notified to begin prosecution of nonregistrants. On June 28, 1982, FBI agents interviewed petitioner, and he continued to refuse to register. Accordingly, on July 22, 1982, an indictment was returned against him for knowingly and willfully failing to register with the Selective Service in violation of §§3 and 12(a) of the Military Selective Service Act, 62 Stat. 605 and 622, as amended, 50 U. S. C. App. §§453 and 462(a). This was one of the first indictments returned against any individual under the passive policy.
[604]*604I — I HH
Petitioner moved to dismiss the indictment on the ground of selective prosecution. He contended that he and the other indicted nonregistrants3 were “vocal” opponents of the registration program who had been impermissibly targeted (out of an estimated 674,000 nonregistrants4) for prosecution on the basis of their exercise of First Amendment rights. After a hearing, the District Court for the Central District of California granted petitioner’s broad request for discovery and directed the Government to produce certain documents and make certain officials available to testify. The Government produced some documents and agreed to make some Government officials available but, citing executive privilege, it withheld other documents and testimony. On October 29, 1982, the District Court ordered the Government to produce the disputed documents and witness. The Government declined to comply and on November 5, 1982, asked the District Court to dismiss the indictment in order to allow an appeal challenging the discovery order. Petitioner asked for dismissal on several grounds, including discriminatory prosecution.
On November 15, 1982, the District Court dismissed the indictment on the ground that the Government had failed to [605]*605rebut petitioner’s prima facie case of selective prosecution.5 Following precedents of the Court of Appeals for the Ninth Circuit, the District Court found that in order to establish a prima facie case petitioner had to prove that (i) others similarly situated generally had not been prosecuted for conduct similar to petitioner’s and (ii) the Government’s discriminatory selection was based on impermissible grounds such as race, religion, or exercise of First Amendment rights. 549 F. Supp. 1376, 1380 (1982).
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Justice Powell
delivered the opinion of the Court.
The question presented is whether a passive enforcement policy under which the Government prosecutes only those who report themselves as having violated the law, or who are reported by others, violates the First and Fifth Amendments.
I — I
On July 2, 1980, pursuant to his authority under § 3 of the Military Selective Service Act, 62 Stat. 605, as amended, 50 U. S. C. App. §453,1 the President issued Presidential Proc[601]*601lamation No. 4771, 3 CFR 82 (1981). This Proclamation directed male citizens and certain male residents born during 1960 to register with the Selective Service System during the week of July 21, 1980. Petitioner fell within that class but did not register. Instead, he wrote several letters to Government officials, including the President, stating that he had not registered and did not intend to do so.2
Petitioner’s letters were added to a Selective Service file of young men who advised that they had failed to register or who were reported by others as having failed to register. For reasons we discuss, infra, at 612-613, Selective Service adopted a policy of passive enforcement under which it would investigate and prosecute only the cases of nonregistration contained in this file. In furtherance of this policy, Selective Service sent a letter on June 17, 1981, to each reported violator who had not registered and for whom it had an address. [602]*602The letter explained the duty to register, stated that Selective Service had information that the person was required to register but had not done so, requested that he either comply with the law by filling out an enclosed registration card or explain why he was not subject to registration, and warned that a violation could result in criminal prosecution and specified penalties. Petitioner received a copy of this letter but did not respond.
On July 20, 1981, Selective Service transmitted to the Department of Justice, for investigation and potential prosecution, the names of petitioner and 133 other young men identified under its passive enforcement system — all of whom had not registered in response to the Service’s June letter. At two later dates, it referred the names of 152 more young men similarly identified. After screening out the names of those who appeared not to be in the class required to register, the Department of Justice referred the remaining names to the Federal Bureau of Investigation for additional inquiry and to the United States Attorneys for the districts in which the nonregistrants resided. Petitioner’s name was one of those referred.
Pursuant to Department of Justice policy, those referred were not immediately prosecuted. Instead, the appropriate United States Attorney was required to notify identified non-registrants by registered mail that, unless they registered within a specified time, prosecution would be considered. In addition, an FBI agent was usually sent to interview the nonregistrant before prosecution was instituted. This effort to persuade nonregistrants to change their minds became known as the “beg” policy. Under it, young men who registered late were not prosecuted, while those who never registered were investigated further by the Government. Pursuant to the “beg” policy, the United States Attorney for the Central District of California sent petitioner a letter on October 15, 1981, urging him to register or face possible prosecution. Again petitioner failed to respond.
[603]*603On December 9, 1981, the Department of Justice instructed all United States Attorneys not to begin seeking indictments against nonregistrants until further notice. On January 7, 1982, the President announced a grace period to afford nonregistrants a further opportunity to register without penalty. This grace period extended until February 28, 1982. Petitioner still did not register.
Over the next few months, the Department decided to begin prosecuting those young men who, despite the grace period and “beg” policy, continued to refuse to register. It recognized that under the passive enforcement system those prosecuted were “liable to be vocal proponents of non-registration” or persons “with religious or moral objections.” Memorandum of March 17, 1982, from Lawrence Lippe, Chief, General Litigation and Legal Advice Section, Criminal Division, Department of Justice, to D. Lowell Jensen, Assistant Attorney General, Criminal Division, App. 301. It also recognized that prosecutions would “undoubtedly result in allegations that the [case was] brought in retribution for the nonregistrant’s exercise of his first amendment rights.” Ibid. The Department was advised, however, that Selective Service could not develop a more “active” enforcement system for quite some time. See infra, at 613. Because of this, the Department decided to begin seeking indictments under the passive system without further delay. On May 21, 1982, United States Attorneys were notified to begin prosecution of nonregistrants. On June 28, 1982, FBI agents interviewed petitioner, and he continued to refuse to register. Accordingly, on July 22, 1982, an indictment was returned against him for knowingly and willfully failing to register with the Selective Service in violation of §§3 and 12(a) of the Military Selective Service Act, 62 Stat. 605 and 622, as amended, 50 U. S. C. App. §§453 and 462(a). This was one of the first indictments returned against any individual under the passive policy.
[604]*604I — I HH
Petitioner moved to dismiss the indictment on the ground of selective prosecution. He contended that he and the other indicted nonregistrants3 were “vocal” opponents of the registration program who had been impermissibly targeted (out of an estimated 674,000 nonregistrants4) for prosecution on the basis of their exercise of First Amendment rights. After a hearing, the District Court for the Central District of California granted petitioner’s broad request for discovery and directed the Government to produce certain documents and make certain officials available to testify. The Government produced some documents and agreed to make some Government officials available but, citing executive privilege, it withheld other documents and testimony. On October 29, 1982, the District Court ordered the Government to produce the disputed documents and witness. The Government declined to comply and on November 5, 1982, asked the District Court to dismiss the indictment in order to allow an appeal challenging the discovery order. Petitioner asked for dismissal on several grounds, including discriminatory prosecution.
On November 15, 1982, the District Court dismissed the indictment on the ground that the Government had failed to [605]*605rebut petitioner’s prima facie case of selective prosecution.5 Following precedents of the Court of Appeals for the Ninth Circuit, the District Court found that in order to establish a prima facie case petitioner had to prove that (i) others similarly situated generally had not been prosecuted for conduct similar to petitioner’s and (ii) the Government’s discriminatory selection was based on impermissible grounds such as race, religion, or exercise of First Amendment rights. 549 F. Supp. 1376, 1380 (1982). Petitioner satisfied the first requirement, the District Court held, because he had shown that all those prosecuted were “vocal” nonregistrants6 and because “[t]he inference is strong that the Government could have located non-vocal non-registrants, but chose not to.” Id., at 1381. The District Court found the second requirement satisfied for three reasons. First, the passive enforcement program was “ ‘inherently suspect’ ” because “ ‘it focuse[d] upon the vocal offender . . . [and was] vulnerable to the charge that those chosen for prosecution [were] being punished for their expression of ideas, a constitutionally protected right.’” Ibid., quoting United States v. Steele, 461 [606]*606F. 2d 1148, 1152 (CA9 1972). Second, the Government’s awareness that a disproportionate number of vocal nonregis-trants would be prosecuted under the passive enforcement system indicated that petitioner was prosecuted because of his exercise of First Amendment rights. 549 F. Supp., at 1382. Finally, the involvement of high Government officials in the prosecution decisions “strongly suggested] impermissible selective prosecution.” Id., at 1383. The District Court then held that the Government had failed to rebut the prima facie case.
The Court of Appeals reversed. 710 F. 2d 1385 (CA9 1983). Applying the same test, it found the first requirement satisfied but not the second. The first was satisfied by petitioner’s showing that out of the estimated 674,000 nonregis-trants the 13 indicted had all been vocal nonregistrants. Id., at 1387. As to the second requirement, the Court of Appeals held that petitioner had to show that the Government focused its investigation on him because of his protest activities. Ibid. Petitioner’s evidence, however, showed only that the Government was aware that the passive enforcement system would result in prosecutions primarily of two types of men — religious and moral objectors and vocal objectors — and that the Government recognized that the latter type would probably make claims of selective prosecution. Finding no evidence of impermissible governmental motivation, the court held that the District Court’s finding of a prima facie case of selective prosecution was clearly erroneous. Id., at 1388. The Court of Appeals also found two legitimate explanations for the Government’s passive enforcement system: (i) the identities of nonreported nonregistrants were not known, and (ii) nonregistrants who expressed their refusal to register made clear their willful violation of the law.7
[607]*607Recognizing both the importance of the question presented and a division in the Circuits,8 we granted certiorari on the question of selective prosecution. 467 U. S. 1214 (1984). We now affirm.
In our criminal justice system, the Government retains “broad discretion” as to whom to prosecute. United States v. Goodwin, 457 U. S. 368, 380, n. 11 (1982); accord, Marshall v. Jerrico, Inc., 446 U. S. 238, 248 (1980). “[S]o long as the prosecutor has probable cause to believe that the accused committed an offense defined by statute, the decision whether or not to prosecute, and what charge to file or bring before a grand jury, generally rests entirely in his discretion.” Bordenkircher v. Hayes, 434 U. S. 357, 364 (1978). This broad discretion rests largely on the recognition that the decision to prosecute is particularly ill-suited to judicial review. Such factors as the strength of the case, the prosecution’s general deterrence value, the Government’s enforcement priorities, and the case’s relationship to the Government’s overall enforcement plan are not readily susceptible to the kind of analysis the courts are competent to undertake. Judicial supervision in this area, moreover, entails systemic costs of particular concern. Examining the basis of a prosecution delays the criminal proceeding, threatens to chill law enforcement by subjecting the prosecutor’s motives and decisionmaking to outside inquiry, and may undermine pros-ecutorial effectiveness by revealing the Government’s enforcement policy. All these are substantial concerns that [608]*608make the courts properly hesitant to examine the decision whether to prosecute.
As we have noted in a slightly different context, however, although prosecutorial discretion is broad, it is not “ ‘unfettered.’ Selectivity in the enforcement of criminal laws is ... subject to constitutional constraints.” United States v. Batchelder, 442 U. S. 114, 125 (1979) (footnote omitted). In particular, the decision to prosecute may not be “‘deliberately based upon an unjustifiable standard such as race, religion, or other arbitrary classification,”’ Bordenkircher v. Hayes, supra, at 364, quoting Oyler v. Boles, 368 U. S. 448, 456 (1962), including the exercise of protected statutory and constitutional rights, see United States v. Goodwin, supra, at 372.
It is appropriate to judge selective prosecution claims according to ordinary equal protection standards.9 See Oyler v. Boles, supra. Under our prior cases, these standards require petitioner to show both that the passive enforcement system had a discriminatory effect and that it was motivated by a discriminatory purpose.10 Personnel Administrator of [609]*609Massachusetts v. Feeney, 442 U. S. 256 (1979); Arlington Heights v. Metropolitan Housing Development Corp., 429 U. S. 252 (1977); Washington v. Davis, 426 U. S. 229 (1976). All petitioner has shown here is that those eventually prosecuted, along with many not prosecuted, reported themselves as having violated the law. He has not shown that the enforcement policy selected nonregistrants for prosecution on the basis of their speech. Indeed, he could not have done so given the way the “beg” policy was carried out. The Government did not prosecute those who reported themselves but later registered. Nor did it prosecute those who protested registration but did not report themselves or were not reported by others. In fact, the Government did not even investigate those who wrote letters to Selective Service criticizing registration unless their letters stated affirmatively that they had refused to comply with the law. Affidavit of Edward A. Frankie, Special Assistant to the Director of Selective Service for Compliance, App. 635. The Govern[610]*610ment, on the other hand, did prosecute people who reported themselves or were reported by others but who did not publicly protest. These facts demonstrate that the Government treated all reported nonregistrants similarly. It did not subject vocal nonregistrants to any special burden. Indeed, those prosecuted in effect selected themselves for prosecution by refusing to register after being reported and warned by the Government.
Even if the passive policy had a discriminatory effect, petitioner has not shown that the Government intended such a result. The evidence he presented demonstrated only that the Government was aware that the passive enforcement policy would result in prosecution of vocal objectors and that they would probably make selective prosecution claims. As we have noted, however: “ ‘Discriminatory purpose’ . . . implies more than . . . intent as awareness of consequences. It implies that the decisionmaker . . . selected or reaffirmed a particular course of action at least in part ‘because of,’ not merely ‘in spite of,’ its adverse effects upon an identifiable group.” Personnel Administrator of Massachusetts v. Feeney, supra, at 279 (footnotes and citations omitted). In the present case, petitioner has not shown that the Government prosecuted him because of his protest activities. Absent such a showing, his claim of selective prosecution fails.
I — I <1
Petitioner also challenges the passive enforcement policy directly on First Amendment grounds.11 In particular, he claims that “[e]ven though the [Government’s passive] enforcement policy did not overtly punish protected speech as [611]*611such, it inevitably created a content-based regulatory system with a concomitantly disparate, content-based impact on non-registrants.” 12 Brief for Petitioner 23. This Court has held that when, as here, “‘speech’ and ‘nonspeech’ elements are combined in the same course of conduct, a sufficiently important governmental interest in regulating the nonspeech element can justify incidental limitations on First Amendment freedoms.” United States v. O’Brien, 391 U. S. 367, 376 (1968). Government regulation is justified
“if it is within the constitutional power of the Government; if it furthers an important or substantial governmental interest; if the governmental interest is unrelated to the suppression of free expression; and if the incidental restriction on alleged First Amendment freedoms is no greater than is essential to the furtherance of that interest.” Id., at 377.
Accord, Seattle Times Co. v. Rhinehart, 467 U. S. 20, 32 (1984); Procunier v. Martinez, 416 U. S. 396, 413 (1974). In the present case, neither the first nor third condition is disputed.
There can be no doubt that the passive enforcement policy meets the second condition. Few interests can be more compelling than a nation’s need to ensure its own security. [612]*612It is well to remember that freedom as we know it has been suppressed in many countries. Unless a society has the capability and will to defend itself from the aggressions of others, constitutional protections of any sort have little meaning. Recognizing this fact, the Framers listed “pro-vid[ing] for the common defence,” U. S. Const., Preamble, as a motivating purpose for the Constitution and granted Congress the power to “provide for the common Defence and general Welfare of the United States,” Art. I, §8, cl. 1. See also The Federalist Nos. 4, 24, and 25. This Court, moreover, has long held that the power “to raise and support armies ... is broad and sweeping,” United States v. O’Brien, supra, at 377; accord, Lichter v. United States, 334 U. S. 742, 755-758 (1948); Selective Draft Law Cases, 245 U. S. 366 (1918), and that the “power ... to classify and conscript manpower for military service is ‘beyond question,’” United States v. O’Brien, supra, at 377, quoting Lichter v. United States, supra, at 756; accord, Selective Draft Law Cases, supra. With these principles in mind, the three reasons the Government offers in defense of this particular enforcement policy are sufficiently compelling to satisfy the second O’Brien requirement — as to either those who reported themselves or those who were reported by others.
First, by relying on reports of nonregistration, the Government was able to identify and prosecute violators without further delay. Although it still was necessary to investigate those reported to make sure that they were required to register and had not, the Government did not have to search actively for the names of these likely violators. Such a search would have been difficult and costly at that time. Indeed, it would be a costly step in any “active” prosecution system involving thousands of nonregistrants. The passive enforcement program thus promoted prosecutorial efficiency. Second, the letters written to Selective Service provided strong, perhaps conclusive evidence of the nonregistrant’s [613]*613intent not to comply — one of the elements of the offense.13 Third, prosecuting visible nonregistrants was thought to be an effective way to promote general deterrence, especially since failing to proceed against publicly known offenders would encourage others to violate the law.
The passive enforcement policy also meets the final requirement of the O’Brien test, for it placed no more limitation on speech than was necessary to ensure registration for the national defense. Passive enforcement not only did not subject “vocal” nonregistrants to any special burden, supra, at 609-610, but also was intended to be only an interim enforcement system. Although Selective Service was engaged in developing an active enforcement program when it investigated petitioner, it had by then found no practicable way of obtaining the names and current addresses of likely non-registrants.14 Eventually, it obtained them by matching state driver’s license records with Social Security files. It took some time, however, to obtain the necessary authorizations and to set up this system. Passive enforcement was the only effective interim solution available to carry out the Government’s compelling interest.
We think it important to note as a final matter how far the implications of petitioner’s First Amendment argument would extend. Strictly speaking, his argument does not con[614]*614cern passive enforcement but self-reporting. The concerns he identifies would apply to all nonregistrants who report themselves even if the Selective Service engaged only in active enforcement. For example, a nonregistrant who wrote a letter informing Selective Service of his failure to register could, when prosecuted under an active system, claim that the Selective Service was prosecuting him only because of his “protest.” Just as in this case, he could have some justification for believing that his letter had focused inquiry upon him. Prosecution in either context would equally “burden” his exercise of First Amendment rights. Under the petitioner’s view, then, the Government could not constitutionally prosecute a self-reporter — even in an active enforcement system — unless perhaps it could prove that it would have prosecuted him without his letter. On principle, such a view would allow any criminal to obtain immunity from prosecution simply by reporting himself and claiming that he did so in order to “protest” the law. The First Amendment confers no such immunity from prosecution.
y
We conclude that the Government’s passive enforcement system together with its “beg” policy violated neither the First nor Fifth Amendment. Accordingly, we affirm the judgment of the Court of Appeals.
It is so ordered.