No kidding. Management should have shut it down years ago in favor of
opening a more profitable non-union plant. I guess it took 68 years of
"negotiations" with UAW to finally win concessions for closing the place.

Please provide ANY evidence that the plat was kept open for 68 years
because of "negotiations with the UAW to finally win concession for
closing the place."

Yeah, that's it. The place was a big loser from day one, and GM would have
closed it right away except for the Union.
Nitrous leak in the office?