Cite as: 527 U. S. 41 (1999)
Opinion of the Court
who may remain in one place with one suspected gang member as long as their purpose is not apparent to an officer observing them. Friends, relatives, teachers, counselors, or even total strangers might unwittingly engage in forbidden loitering if they happen to engage in idle conversation with a gang member.
Ironically, the definition of loitering in the Chicago ordinance not only extends its scope to encompass harmless conduct, but also has the perverse consequence of excluding from its coverage much of the intimidating conduct that motivated its enactment. As the city council's findings demonstrate, the most harmful gang loitering is motivated either by an apparent purpose to publicize the gang's dominance of certain territory, thereby intimidating nonmembers, or by an equally apparent purpose to conceal ongoing commerce in illegal drugs. As the Illinois Supreme Court has not placed any limiting construction on the language in the ordinance, we must assume that the ordinance means what it says and that it has no application to loiterers whose purpose is apparent. The relative importance of its application to harmless loitering is magnified by its inapplicability to loitering that has an obviously threatening or illicit purpose.
Finally, in its opinion striking down the ordinance, the Illinois Supreme Court refused to accept the general order issued by the police department as a sufficient limitation on the "vast amount of discretion" granted to the police in its enforcement. We agree. See Smith v. Goguen, 415 U. S. 566, 575 (1974). That the police have adopted internal rules limiting their enforcement to certain designated areas in the city would not provide a defense to a loiterer who might be arrested elsewhere. Nor could a person who knowingly loitered with a well-known gang member anywhere in the city
"that he knew he was with criminal street gang members." Reply Brief for Petitioner 23, n. 14. In fact, 34 of the 66 respondents in this case were charged in a document that only accused them of being in the presence of a gang member. Tr. of Oral Arg. 34, 58.
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