Ah, yes. Just like how Ford, famously heavily unionized, folded and disappeared as Kia took over.
A link to a long series about the interaction between US automakers and the unions is below. Of note is the story about how automakers' market share declined precipitously in the early eighties when Japanese automakers figured out the US market.
The US auto industry is not a great example of how a union can work with an employer in the face of existential threats.
https://www.nytimes.com/interactive/2015/10/08/business/uaw-...
https://www.washingtonpost.com/archive/business/1981/10/11/f...
https://www.investopedia.com/articles/economics/chrysler-bai... (Heavy International Competition)
Unions were not who was responsible for their atrocious offerings during the 70s to 2000s.