The UAW had only been formed in 1935 and held its first convention in 1936. Shortly thereafter the union decided that it could not survive by piecemeal organizing campaigns at smaller plants, as it had in the past, but that it could organize the automobile industry only by going after its biggest and most powerful employer, General Motors Corporation, focusing on GM's production complex in Flint, Michigan.
Organizing in Flint was a difficult and dangerous plan. GM controlled city politics in Flint and kept a close eye on outsiders. As Wyndham Mortimer, the UAW officer put in charge of the organizing campaign in Flint, recalled, when he visited Flint in 1936 he received a telephone call within a few minutes of checking into his hotel from an anonymous caller telling him to get back where he came from if he didn't "want to be carried out in a wooden box".
GM also maintained an extensive network of spies throughout its plants. Mortimer concluded after talking to Flint autoworkers that the existing locals, which had only 122 members out of 45,000 autoworkers in Flint, were riddled with spies. Accordingly, he decided that the only safe way to organize Flint was simply to bypass those locals. Mortimer,
Roy Reuther, Henry Kraus, and
Ralph Dale began meeting with Flint autoworkers in their homes, keeping the names of new members a closely guarded secret from others in Flint and at UAW headquarters.
As the UAW studied its target, it discovered that GM had only two factories that produced the dies from which car body components were stamped: one in Flint that produced the parts for Buicks, Pontiacs, and Oldsmobiles, and another in Cleveland that produced Chevrolet parts. The union planned to strike these plants after the New Year, when Frank Murphy would become Governor of Michigan.