The Ford Motor Company signs a "Technical Assistance" contract to produce cars in the Soviet Union, and Ford workers were sent to the Soviet Union to train the labor force in the use of its parts. Many American workers who made the trip, including Walter Reuther, a tool and die maker who later was to become the UAW's president, returned home with a different view of the duties and privileges of the industrial laborer - 1929
Animators working for Walt Disney begin what was to become a successful 5-week strike for recognition of their union, the Screen Cartoonists' Guild. The animated featureDumbo was being created at the time and, according to Wikipedia, a number of strikers are caricatured in the feature as clowns who go to "hit the big boss for a raise" - 1941