Organizing in Flint was a difficult and dangerous plan. GM controlled city politics in Flint and kept a close eye on outsiders. According to Wyndham Mortimer, the UAW officer put in charge of the organizing campaign in Flint, he received a death threat by an anonymous caller when he visited Flint in 1936. GM also maintained an extensive network of spies throughout its plants. This forced UAW members to keep the names of new members in secret and meeting workers at their homes.