Nightbreed

Nightbreed is a 1990 American dark fantasy horror film written and directed by Clive Barker, based on his 1988 novella Cabal. It stars Craig Sheffer, Anne Bobby, David Cronenberg, Charles Haid, Hugh Quarshie, and Doug Bradley. The film follows an unstable mental patient named Aaron Boone who is falsely led to believe by his doctor that he is a serial killer. Tracked down by the police, his doctor, and his girlfriend Lori, Boone eventually finds refuge in an abandoned cemetery called Midian among a tribe of monsters and outcasts known as the "Nightbreed" who hide from humanity.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.