Chicago v. Morales
JUSTICE O’CONNOR, with whom JUSTICE BREYER joins, concurring in part and concurring in the judgment.
I agree with the Court that Chicago’s Gang Congregation Ordinance, Chicago Municipal Code § 8-4-015 (1992) (gang loitering ordinance or ordinance) is unconstitutionally vague. A penal law is void for vagueness if it fails to “define the criminal offense with sufficient definiteness that ordinary people can understand what conduct is prohibited” or fails to 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
