Unifor says GM Oshawa closure could throw 1,700 parts workers out of a job Unifor says GM Oshawa closure could throw 1,700 parts workers out of a job June 25, 2019 dzadmin Comments 0 Comment Unifor, the union that represents about 40,000 workers in the auto industry, wants to ensure parts workers affected by GM’s decision to end vehicle assembly at its Oshawa, Ont., plant are fairly compensated for the coinciding loss of jobs.