Until this week, the UAW had not gone on strike against Ford Motor Co. since the 1970s.
The union also had never struck all three Detroit automakers at the same time before now. But it has called a number of work stoppages during its 88-year history in quests for better pay, benefits and working conditions.
Here's a look at some of the more notable times when the UAW sent its members onto the picket lines over the years:
2019 General Motors strike: 40 days, 48,000 workers
UAW members walked off the job over concerns including the use of temporary workers and wage tiers, as well as the future of certain U.S. plants. Workers ultimately ratified a four-year contract that included commitments of $7.7 billion in U.S. plants and a way for temporary workers to reach full-time status.
2007 Chrysler strike: 1 day, 45,000 workers
The UAW reached a tentative agreement on a new contract only hours after sending Chrysler worker onto picket lines. The 2007 contracts introduced concessions still at issue today, including lower wages for new hires.