A Clockwork Orange (1971)

Directed by Stanley Kubrick and based on Anthony Burgess’s book, A Clockwork Orange stars Malcolm McDowell as Alex, the teenage leader of a violent gang in a dystopian near-future Britain. After being imprisoned, Alex undergoes an experimental programme designed to condition him against violence, turning him into a test case in a wider struggle over free will, punishment and state control. Kubrick’s film combines dystopian science fiction, social satire and psychological drama with an intensely stylised portrayal of violence and institutional power.

Från IMDB:
Alex DeLarge and his droogs barbarize a decaying near-future.