Pricing themselves out of existence.
How many unionized jobs have gone across the pond since the 50's?
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it is not just pricing. It is also environmental, health and safety. If we didnt focus on these things when unions were strong, the US would be be a bigger sh- hole than China is today. We breath clean air, have clean water, sanitary sewer systems, and safe work environments. Men like my SEIU union father put three kids through college and today his grandkids are medical doctors, scientists, and teachers. Cant do that in countries these jobs went to.
I believe unions failed to adapt. But they made a lasting impression in todays business and for that i am forever grateful.