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Opinion of Stevens, J.
that a law that directly prohibited such intimidating conduct would be constitutional,17 but this ordinance broadly covers a significant amount of additional activity. Uncertainty about the scope of that additional coverage provides the basis for respondents' claim that the ordinance is too vague.
We are confronted at the outset with the city's claim that it was improper for the state courts to conclude that the ordinance is invalid on its face. The city correctly points out that imprecise laws can be attacked on their face under two different doctrines.18 First, the overbreadth doctrine permits the facial invalidation of laws that inhibit the exercise of First Amendment rights if the impermissible applications of the law are substantial when "judged in relation to the statute's plainly legitimate sweep." Broadrick v. Oklahoma, 413 U. S. 601, 612-615 (1973). Second, even if an enactment does not reach a substantial amount of constitutionally protected conduct, it may be impermissibly vague because it fails to establish standards for the police and public that are sufficient to guard against the arbitrary deprivation of liberty interests. Kolender v. Lawson, 461 U. S. 352, 358 (1983).
While we, like the Illinois courts, conclude that the ordinance is invalid on its face, we do not rely on the overbreadth doctrine. We agree with the city's submission that the law does not have a sufficiently substantial impact on conduct
17 In fact the city already has several laws that serve this purpose. See, e. g., Ill. Comp. Stat., ch. 720 §§ 5/12-6 (1998) (intimidation); 570/405.2 (streetgang criminal drug conspiracy); 147/1 et seq. (Illinois Streetgang Terrorism Omnibus Prevention Act); 5/25-1 (mob action). Deputy Superintendent Cooper, the only representative of the police department at the Committee on Police and Fire hearing on the ordinance, testified that, of the kinds of behavior people had discussed at the hearing, "90 percent of those instances are actually criminal offenses where people, in fact, can be arrested." Record, Appendix II to plaintiff's Memorandum in Opposition to Motion to Dismiss 182 (Tr. of Proceedings, Chicago City Council Committee on Police and Fire, May 18, 1992).
18 Brief for Petitioner 17.
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