During a news conference in Detroit on Sunday morning, United Auto Workers spokesman Brian Rothenberg said GM workers across the country would form picket lines at 11:59 p.m., 24 hours after a four-year labor contract expired.
"At midnight tonight, the picket lines will go up," Rothenberg said. "But basically, when the morning shift would have reported for work, they won't be there. The picket lines are being set up."
UAW confirmed in a one-sentence statement at 11:59 p.m. that the strike had begun. Workers were filmed marching outside a GM assembly plant in Hamtramck, Michigan, at midnight.