with whom The Chief Justice, Justice O’Connor, and Justice Kennedy join, concurring in the judgment.
Four Terms ago, in Sedima, S. P. R. L. v. Imrex Co., 473 U. S. 479 (1985), we gave lower courts the following four clues concerning the meaning of the enigmatic term “pattern of racketeering activity” in the Racketeer Influenced and Corrupt Organizations Act (RICO or Act), Pub. L. 91-452, Title IX, 84 Stat. 941, as amended, 18 U. S. C. §§ 1961-1968 (1982 ed. and Supp. V). First, we stated that the statutory definition of the term in 18 U. S. C. § 1961(5) implies “that while two acts are necessary, they may not be sufficient.” Sedima, 473 U. S., at 496, n. 14. Second, we pointed out that “two isolated acts of racketeering activity,” “sporadic activity,” and “proof of two acts of racketeering activity, without more” would not be enough to constitute a pattern. Ibid. Third, we quoted a snippet from the legislative history stating “[i]t is this factor of continuity plus relationship which combines to produce a pattern.” Ibid. Finally, we directed lower courts’ attention to 18 U. S. C. § 3575(e), which defined the term “pattern of conduct which was criminal” used in a different title of the same Act, and instructed them that “[t]his language may be useful in interpreting other sections of the Act,” 473 U. S., at 496, n. 14. Thus enlightened, the District Courts and Courts of Appeals set out “to develop a meaningful concept of ‘pattern,’” id., at 500, and promptly produced the widest and most persistent Circuit split on an issue of federal law in recent memory, see, e. g., ante, at 235, n. 2. Today, four years and countless millions in damages and attorney’s fees later (not to mention ’'prison sentences under the criminal provisions of RICO), the Court does little more than repromulgate those hints as to what RICO means, though with the caveat that Congress intended that they be applied using a “flexible approach.” Ante, at 238.
*252Elevating to the level of statutory text a phrase taken from the legislative history, the Court counsels the lower courts: “‘continuity plus relationship.’” Ante, at 239 (emphasis deleted). This seems to me about as helpful to the conduct of their affairs as “life is a fountain.” Of the two parts of this talismanic phrase, the relatedness requirement is said to be the “easier to define,” ibid., yet here is the Court’s definition, in toto: “ ‘[CJriminal conduct forms a pattern if it embraces criminal acts that have the same or similar purposes, results, participants, victims, or methods of commission, or otherwise are interrelated by distinguishing characteristics and are not isolated events,’ ” ante, at 240. This definition has the feel of being solidly rooted in law, since it is a direct quotation of 18 U. S. C. § 3575(e). Unfortunately, if normal (and sensible) rules of statutory construction were followed, the existence of § 3575(e) — which is the definition contained in another title of the Act that was explicitly not rendered applicable to RICO — suggests that whatever “pattern” might mean in RICO, it assuredly does not mean that. “[Wjhere Congress includes particular language in one section of a statute but omits it in another section of the same Act, it is generally presumed that Congress acts intentionally and purposely in the disparate inclusion or exclusion.” Russello v. United States, 464 U. S. 16, 23 (1983). But that does not really matter, since § 3575(e) is utterly uninformative anyway. It hardly closes in on the target to know that “relatedness” refers to acts that are related by “purposes, results, participants, victims, . . . methods of commission, or [just in case that is not vague enough] otherwise.” Is the fact that the victims of both predicate, acts were women enough? Or that both acts had the purpose of enriching the defendant? Or that the different coparticipants of the defendant in both acts were his coemployees? I doubt that the lower courts will find the Court’s instructions much more helpful than telling them to look for a “pattern” — which is what the statute already says.
*253The Court finds “continuity” more difficult to define precisely. “Continuity,” it says, “is both a closed- and open-ended concept, referring either to a closed period of repeated conduct, or to past conduct that by its nature projects into the future with a threat of repetition.” Ante, at 241. I have no idea what this concept of a “closed period of repeated conduct” means. Virtually all allegations of racketeering activity, in both civil and criminal suits, will relate to past periods that are “closed” (unless one expects plaintiff or the prosecutor to establish that the defendant not only committed the crimes he did, but is still committing them), and all of them must relate to conduct that is “repeated,” because of RICO’s multiple-act requirement. I had thought, initially, that the Court was seeking to draw a distinction between, on the one hand, past repeated conduct (multiple racketeering acts) that is “closed-ended” in the sense that, in its totality, it constitutes only one criminal “scheme” or “episode” — which would not fall within RICO unless in its nature (for one or more of the reasons later described by the Court, see ante, at 242-243) it threatened future criminal endeavors as well — and, on the other hand, past repeated conduct (multiple racketeering acts) that constitutes several separate schemes — which is alone enough to invoke RICO. But of course that cannot be what it means, since the Court rejects the “multiple scheme” concept, not merely as the exclusive touchstone of RICO liability, see ante, at 240, but in all its applications, since it “introduc[es] a concept . . . that appears nowhere in the language or legislative history of the Act,” ante, at 241, and is so vague and “amorphous” as to exist only “in the eye of the beholder,” ante, at 241, n. 3. Moreover, the Court tells us that predicate acts extending, not over a “substantial period of time,” but only over a “few weeks or months and threatening no future criminal conduct” do not satisfy the continuity requirement. Ante, at 242. Since the Court has rejected the concept of separate criminal “schemes” or “episodes” as a criterion of “threatening future criminal conduct,” *254I think it must be saying that at least a few months of racketeering activity (and who knows how much more?) is generally for free, as far as RICO is concerned. The “closed period” concept is a sort of safe harbor for racketeering activity that does not last too long, no matter how many different crimes and different schemes are involved, so long as it does not otherwise “establish a threat of continued racketeering activity,” ibid. A gang of hoodlums that commits one act of extortion on Monday in New York, a second in Chicago on Tuesday, a third in San Francisco on Wednesday, and so on through an entire week, and then finally and completely disbands, cannot be reached under RICO. I am sure that is not what the statute intends, but I cannot imagine what else the Court’s murky discussion can possibly mean.
Of course it cannot be said that the Court’s opinion operates only in the direction of letting some obvious racketeers get out of RICO. It also makes it clear that a hitherto dubious category is included, by establishing the rule that the “multiple scheme” test applied by the Court of Appeals here is not only nonexclusive but indeed nonexistent. This is, as far as I can discern, the Court’s only substantive contribution to our prior guidance — and it is a contribution that makes it more rather than less difficult for a potential defendant to know whether his conduct is covered by RICO. Even if he is only involved in a single scheme, he may still be covered if there is present whatever is needed to establish a “threat of continuity.” The Court gives us a nonexclusive list of three things that do so. Two of those presumably polar examples seem to me extremely difficult to apply — whether “the predicates can be attributed to a defendant operating as part of a long-term association that exists for criminal purposes,” ante, at 243, and whether “the predicates are a regular way of conducting defendant’s ongoing legitimate business,” ibid. What is included beyond these examples is vaguer still.
It is, however, unfair to be so critical of the Court’s effort, because I would be unable to provide an interpretation of *255RICO that gives significantly more guidance concerning its application. It is clear to me from the prologue of the statute, which describes a relatively narrow focus upon “organized crime,” see Statement of Findings and Purpose, The Organized Crime Control Act of 1970, Pub. L. 91-452, 84 Stat. 922-928, that the word “pattern” in the phrase “pattern of racketeering activity” was meant to import some requirement beyond the mere existence of multiple predicate acts. Thus, when § 1961(5) says that a pattern “requires at least two acts of racketeering activity” it is describing what is needful but not sufficient. (If that were not the case, the concept of “pattern” would have been unnecessary, and the statute could simply have attached liability to “multiple acts of racketeering activity”). But what that something more is, is beyond me. As I have suggested, it is also beyond the Court. Today’s opinion has added nothing to improve our prior guidance, which has created a kaleidoscope of Circuit positions, except to clarify that RICO may in addition be violated when there is a “threat of continuity.” It seems to me this increases rather than removes the vagueness. There is no reason to believe that the Courts of Appeals will be any more unified in the’ future, than they have in the past, regarding the content of this law.
That situation is bad enough with respect to any statute, but it is intolerable with respect to RICO. For it is not only true, as Justice Marshall commented in Sedima, S. P. R. L. v. Imrex Co., 473 U. S. 479 (1985), that our interpretation of RICO has “quite simply revolutionize^] private litigation” and “validate[d] the federalization of broad areas of state common law of frauds,” id., at 501 (dissenting opinion), so that clarity and predictability in RICO’s civil applications are particularly important; but it is also true that RICO, since it has criminal applications as well, must, even in its civil applications, possess the degree of certainty required for criminal laws, FCC v. American Broadcasting Co., 347 U. S. 284, 296 (1954). No constitutional challenge *256to this law has been raised in the present case, and so that issue is not before us. That the highest Court in the land has been unable to derive from this statute anything more than today’s meager guidance bodes ill for the day when that challenge is presented.
However unhelpful its guidance may be, however, I think the Court is correct in saying that nothing in the statute supports the proposition that predicate acts constituting part of a single scheme (or single episode) can never support a cause of action under RICO. Since the Court of Appeals here rested its decision on the contrary proposition, I concur in the judgment of the Court reversing the decision below.