Reminds me of this related article about why unions have a tricky time supporting migrant workers. https://www.opendemocracy.net/en/beyond-trafficking-and-slavery/an-indictment-of-the-trade-union-movement-why-no-one-is-organising-seasonal-workers/

tl;dr seasonal workers don’t become members and so the union can’t/won’t support them.

A nation’s engineering sector mostly built on military doesn’t inspire much confidence in me.