General Motors replaces 1,000-plus Factory Zero workers with 50 cobots
GM cites safety as UAW protests 
GM says the robots help improve safety and ergonomics, but not everyone's convinced.
The United Auto Workers union is protesting the job cuts and raising concerns about working conditions.
As UAW Local 22 President James Cotton put it, "Our manpower is being taken away."
The union has also filed grievances about safety issues around the new robot coworkers.
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