70s movie about gangs where 3 bald men joined the marines

Prominent gang leader Cyrus calls a meeting of New York's gangs to set aside their turf wars and take over the city. 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.

The Warriors is set in the world of Australian Rules Football. It explores the elite world of professional sport through the eyes of two new recruits - plucked from obscurity to fame and fortune - and two established players as they are thrown together in a share house in Melbourne.