Young southerner Marco Russo moves to the mafia-controlled north of Italy and finds work with the powerful Manzetti family. He then proceeds to stir the pot between the Manzettis and their top rivals the Belmondos.
Stelvio Massi's crime thriller centers on a drifter who sets out to help blue-collar workers rise up against the two powerful families who are exploiting them. After settling in an industrial town and witnessing the cruelty of the factory owners, ex-mercenary Marco (Carlos Monzón) assumes the role of union agitator. When a violent confrontation erupts, the labor leader is driven to bring down the corrupt clans.
