The ordinance at issue in that case, entitled the Gang Congregation Ordinance, forbade "criminal street gang members" from loitering in public places, defined as "remain in any one place with no apparent purpose." Under the ordinance, a police officer who observed someone whom he or she reasonably believed to be a gang member loitering with one or more other people could order them to disperse. Anyone who did not obey would be considered in violation of the ordinance and subject to arrest.