>There was this gang that had to get from one side of the city back to the other. They ran into all these other rival gangs that were always dressed in some sort of theme. One was all on roller skates, the other were dressed in baseball type uniforms and carred bats, etc. I know, sounds like I'm making it up, but the movie existed.
As Jos and Bill told you, I also think the movie is "The Warriors"; if you liked it, from the same director there is a movie called "Streets of Fire (a Rock and Roll Fable)" (IIRC) that I loved.
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges