President Franklin D. Roosevelt signed the National Labor Relations Act (also called the Wagner Act), creating a stronger federal framework for union elections and collective bargaining in much of the private sector. This legal change mattered for auto workers because it gave organizing drives a clearer path to recognition and enforcement.
Delegates met in Detroit to launch what became the United Auto Workers as an industry-wide union effort. The union’s early formation created an organization capable of coordinating actions across multiple auto plants, setting the stage for large-scale tactics like sit-down strikes.
Workers started occupying key General Motors facilities in Flint, Michigan rather than leaving the workplace. This “sit-down” tactic aimed to stop production while preventing the company from using replacement workers or moving critical equipment out of the plants.
During the Flint dispute, police attempted to enter an occupied plant, leading to a violent confrontation that became known as the “Battle of Running Bulls.” The clash highlighted how tense and unpredictable sit-down strikes could become and increased pressure on public officials to address the standoff.
Strikers expanded their occupation by taking control of Chevrolet Plant No. 4 in Flint. Capturing additional production capacity strengthened the union’s leverage by widening the shutdown and making a negotiated settlement more urgent for GM.
General Motors signed an agreement that recognized the UAW as a collective bargaining agency for its members, ending the Flint sit-down strike. This was a major turning point: it helped move the UAW from a new organizing effort into a recognized bargaining force in the auto industry.
UAW organizers attempted to hand out pro-union leaflets near Ford’s River Rouge complex in Dearborn, Michigan, and were beaten by Ford’s security forces. The incident drew national attention and underscored how fiercely Ford resisted UAW organizing even after union gains at GM.
The UAW launched a strike centered on tool-and-die makers—high-skill workers crucial to keeping production running. By focusing pressure on a key bottleneck in manufacturing, the union aimed to strengthen its standing and push the auto industry toward more stable, union-centered bargaining structures.
After the 1939 “strategy strike,” a large representation vote was held under federal labor law procedures to decide which union would represent GM workers. The election mattered because it translated shop-floor conflict into formal, government-recognized bargaining rights.
GM and the UAW reached a national agreement covering multiple plants, a step beyond earlier, more limited arrangements. This kind of company-wide contract helped standardize wages and rules and made labor relations more predictable across the corporation.
A walkout at Ford’s Rouge complex escalated pressure on the last major auto company still resisting UAW recognition. The shutdown showed that UAW organizing had gained enough strength at Ford to disrupt production, making continued refusal harder to sustain.
Ford Motor Company signed its first agreement with the UAW, ending its status as the major holdout among leading automakers. With a contract in place, UAW organizing in the auto industry moved from breakthrough strikes to an established system of collective bargaining across the “Big Three,” closing the main chapter of 1936–1941 sit-down–era organizing.
United Auto Workers (UAW) — sit-down strikes and 1930s organizing (1936–1941)