Cite as: 521 U. S. 179 (1997)
Opinion of the Court
trine is invoked fairly often, relevant authority uniformly supports the requirement. Professor Areeda says, for example, that "[t]he concealment requirement is satisfied only if the plaintiff shows that he neither knew nor, in the exercise of due diligence, could reasonably have known of the offense." 2 Areeda ¶ 338, at 152; see also I. Scher, Antitrust Adviser § 10.27, p. 10-62 (4th ed. 1995). We have found many antitrust cases that say the same, and none that says the contrary. See, e. g., Conmar Corp. v. Mitsui & Co., 858 F. 2d 499, 502 (CA9 1988), cert. denied sub nom. VSL Corp. v. Conmar Corp., 488 U. S. 1010 (1989); Texas v. Allan Constr. Co., 851 F. 2d 1526, 1533 (CA5 1988); Pinney Dock & Transport Co. v. Penn Central Corp., 838 F. 2d 1445, 1465 (CA6), cert. denied sub nom. Pinney Dock & Transport Co. v. Norfolk & Western R. Co., 488 U. S. 880 (1988); New York v. Hendrickson Bros., Inc., 840 F. 2d 1065, 1083 (CA2), cert. denied, 488 U. S. 848 (1988); Berkson v. Del Monte Corp., 743 F. 2d 53, 56 (CA1 1984), cert. denied, 470 U. S. 1056 (1985); Charlotte Telecasters, Inc. v. Jefferson-Pilot Corp., 546 F. 2d 570, 574 (CA4 1976).
Second, those courts that do not require "reasonable diligence" have said that the "fraudulent concealment" doctrine seeks to punish defendants for affirmative, discrete acts of concealment; the behavior of plaintiffs is consequently irrelevant. See Wolin, supra, at 852; Robertson v. Seidman & Seidman, 609 F. 2d 583, 593 (CA2 1979); cf. Urland, supra, at 1280-1281 (Becker, J., dissenting). Whether or not that is so in the legal contexts at issue in those cases (which were not antitrust cases), it is not so in respect either to antitrust or to civil RICO. Rather, in both of those latter contexts private civil actions seek not only to compensate victims but also to encourage those victims themselves diligently to investigate and thereby to uncover unlawful activity. See Malley-Duff, 483 U. S., at 151. That being so, we cannot say that the "fraudulent concealment" is concerned only with the behavior of defendants. For that reason, and in light of the
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