Couldn't help but wonder what role the union played in the recent GM plant harassment case. They're gonna hang a noose and GM is still too scared/unable to fir

Couldn't help but wonder what role the union played in the recent GM plant harassment case. They're gonna hang a noose and GM is still too scared/unable to fire them? Am I misreading this? But also can easily also see how merit based promotion at a production plant would be used to work workers to the bone. Gotta be some kind of balance.