I'd like to see where they're ensuring long term viability - every group they work with in the US is either facing a pension crisis or is not thriving.
That is simply not true and a common anti-union trope. Unions should have mandatory representation on corporate boards. Broadcom would be my first choice.
I knew someone through a friend that was kicked out of the carpenters union for not being good enough. Their accreditation can be quite strict.