This is a simple case. Petitioners, accompanied by Chicago police and an assistant city attorney, marched in a peaceful and orderly procession from city hall to the mayor's residence to press their claims for desegregation of the public schools. Having promised to cease singing at 8:30 p. m., the marchers did so. Although petitioners and the other demonstrators continued to march in a completely lawful fashion, the onlookers became unruly as the number of bystanders increased. *112 Chicago police, to prevent what they regarded as an impending civil disorder, demanded that the demonstrators, upon pain of arrest, disperse. When this command was not obeyed, petitioners were arrested for disorderly conduct.

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