niteflight:

Deborah Van Valkenburgh in The Warriors (1979)

A prominent New York City gang leader named Cyrus (Roger Hill) wants to wage an all-out battle against the police, and as part of his strategy he calls upon Gotham’s gangs to set aside their turf wars and come together at a summit. At the meeting, a rival leader kills Cyrus, but a Coney Island gang called the Warriors is wrongly blamed for Cyrus’ death. Before you know it, the cops and every gangbanger in town is hot on the Warriors’ trail.