While racism smolders overhead in the streets of South London, an underground cabal of black Britons seeks refuge, set to the heavy dub of Aswad’s “Warrior Charge.” An incisive declamation of racial inequality under Margaret Thatcher, Babylon revolves around Rasta sound system leader Blue (Forde) as he defends his musical ambitions against the xenophobia of employers, neighbors, police, and the National Front. Rosso’s fearless, unsentimental film tempers the hazy bliss of the dancehall with harrowing scenes of violence.