60
Opinion of the Court
stitutionally vague if the definition of the forbidden conduct were clear, but it does buttress our conclusion that the entire ordinance fails to give the ordinary citizen adequate notice of what is forbidden and what is permitted. The Constitution does not permit a legislature to "set a net large enough to catch all possible offenders, and leave it to the courts to step inside and say who could be rightfully detained, and who should be set at large." United States v. Reese, 92 U. S. 214, 221 (1876). This ordinance is therefore vague "not in the sense that it requires a person to conform his conduct to an imprecise but comprehensible normative standard, but rather in the sense that no standard of conduct is specified at all." Coates v. Cincinnati, 402 U. S. 611, 614 (1971).
V
The broad sweep of the ordinance also violates " 'the requirement that a legislature establish minimal guidelines to govern law enforcement.' " Kolender v. Lawson, 461 U. S., at 358. There are no such guidelines in the ordinance. In any public place in the city of Chicago, persons who stand or sit in the company of a gang member may be ordered to disperse unless their purpose is apparent. The mandatory language in the enactment directs the police to issue an order without first making any inquiry about their possible purposes. It matters not whether the reason that a gang member and his father, for example, might loiter near Wrigley Field is to rob an unsuspecting fan or just to get a glimpse of Sammy Sosa leaving the ballpark; in either event, if their purpose is not apparent to a nearby police officer, she may— indeed, she "shall"—order them to disperse.
Recognizing that the ordinance does reach a substantial amount of innocent conduct, we turn, then, to its language to determine if it "necessarily entrusts lawmaking to the moment-to-moment judgment of the policeman on his beat." Kolender v. Lawson, 461 U. S., at 360 (internal quotation marks omitted). As we discussed in the context of fair no-
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