Dec. 4, 2018—The UAW sent a letter to GM's head of labor relations on Monday, pushing back against the announcement last week that put the fate of five plants and thousands of workers jobs up in the air, reported The Detroit Free Press.

Terry Dittes, UAW vice president and director of the union's GM department said in the letter that the company had violated commitments during 2015 contract bargaining.

At issue was the company's use of the wording in the company's announcement, when it said the plants, including Detroit-Hamtramck Assembly and Warren Transmission, "will be unallocated in 2019."