Today in Labor History February 11, 1937: General Motors recognized the United Auto Workers (UAW) following a 44-day sit-down strike in Flint, Michigan, involving 48,000 GM workers. Two months later, company guards beat up UAW leaders at the River Rouge, Michigan plant. On January 11, police armed with guns and tear gas tried to storm the plant. Strikers repeatedly repelled them by throwing hinges, bottles and bolts at them. Fourteen strikers were injured by police gunfire during the strike.