Grajski biki is a 1967 Yugoslav film directed by Jože Pogačnik. Its international English title is Stronghold of Toughs.


The film is a somber social drama in which war orphans rebel against teachers and authority figures in their reform school. It stars Danny, a teen punk who organizes a breakout, only to become a victim of the code of toughness by which he lives. Sex and violence are included in the sometimes confusing story that appeared at the Mannheim Film Festival in 1967.