Blue Collar

Blue Collar is a movie starring Richard Pryor, Harvey Keitel, and Yaphet Kotto. When three workers try to steal from the local union, they discover the corruption of the union instead and decide to blackmail them.
Fed up with mistreatment at the hands of both management and union brass, and coupled with financial hardships on each man's end, three auto assembly line workers hatch a plan to rob a safe at union headquarters.