Oi! Warning (1999)

Eighteen-year-old Janosch, attractive and intelligent, leaves his boring life in a small lakeside town to live with Koma, an old schoolmate now living in a larger city. Janosch idolizes skinhead Koma--a tall, strong kick-boxer with a job, an apartment, a car, and a pregnant girlfriend. The younger man soon remakes himself into his hero's image, becoming a skinhead himself and beating up punks as part of the long-standing rivalry between the two groups. But when Janosch meets Zottel, a left-wing anarchist punk, he becomes instantly captivated, raising the jealously of the violent Koma.