Cite as: 527 U. S. 41 (1999)
Opinion of O'Connor, J.
establish guidelines to prevent "arbitrary and discriminatory enforcement" of the law. Kolender v. Lawson, 461 U. S. 352, 357 (1983). Of these, "the more important aspect of the vagueness doctrine 'is . . . the requirement that a legislature establish minimal guidelines to govern law enforcement.' " Id., at 358 (quoting Smith v. Goguen, 415 U. S. 566, 574-575 (1974)). I share Justice Thomas' concern about the consequences of gang violence, and I agree that some degree of police discretion is necessary to allow the police "to perform their peacekeeping responsibilities satisfactorily." Post, at 109 (dissenting opinion). A criminal law, however, must not permit policemen, prosecutors, and juries to conduct " 'a standardless sweep . . . to pursue their personal predilections.' " Kolender v. Lawson, supra, at 358 (quoting Smith v. Goguen, supra, at 575).
The ordinance at issue provides:
"Whenever a police officer observes a person whom he reasonably believes to be a criminal street gang member loitering in any public place with one or more other persons, he shall order all such persons to disperse and remove themselves from the area. Any person who does not promptly obey such an order is in violation of this section." App. to Pet. for Cert. 61a.
To "[l]oiter," in turn, is defined in the ordinance as "to remain in any one place with no apparent purpose." Ibid. The Illinois Supreme Court declined to adopt a limiting construction of the ordinance and concluded that the ordinance vested "absolute discretion to police officers." 177 Ill. 2d 440, 457, 687 N. E. 2d 53, 63 (1997) (emphasis added). This Court is bound by the Illinois Supreme Court's construction of the ordinance. See Terminiello v. Chicago, 337 U. S. 1, 4 (1949).
As it has been construed by the Illinois court, Chicago's gang loitering ordinance is unconstitutionally vague because it lacks sufficient minimal standards to guide law enforce-
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