My wife’s current employer has increased the compensation of their employees 30% since the employees started the unionization process.
Pretty dramatic display of how little they valued their staff and how much actual “room in the budget” they have to treat folks fairly if they actually need to.
She’s leaving for company with a union, pay is about the same as her current one even though the cost of living is dramatically lower, the union has gotten the employer to provide vacation pay, cell phone stipends, parking which is hilarious that that’s a issue but yes wife’s current job doesn’t provide parking, and has actually demanded that they stick to duty hours instead of the employer just telling their staff to lie about hours so the company doesn’t lose its license.
These jobs can’t leave the community much less the US so it’s a bit apples to oranges.
That said I’m unconvinced that if those labor unions you mentioned hadn’t existed those jobs would have stayed. There are plenty of industries that have moved to Asia that didn’t have unions.