Blue Collar(1978)

Three guys, two African-American and one Polish, work on the production line in a Detroit automobile factory, and they are fed-up with the conditions. It dawns on them that their workers' union is doing them no greater good than their screwed-up bosses. So the trio pulls off a clumsy robbery at union HQ, in which they only gain accees to some suspicious documents that point to union links with organized crime. Suddenly they're out of their league: violence, paranoia, rivarly, and recrimination erupt around them.