I used to belong to a union, Teamster's local 480. While the union did some good things for us, we got good wages, and we had reasonable breaks, there was so much abuse that went on it was sickening. It eventually killed one company I worked for, and that cost my parents their farm, as my Dad worked for the same company, and we both lost jobs.
I watched the IBEW take the GE plant here from 1600 workers and the best benefits in the area down to the point where it closed 3 months ago. GE actually had better benefits than Nissan, and the compensation package exceeded what Nissan paid here. The union came in, and a plant that had not missed a delivery in 35 years couldn't deliver on time on a bet. Sure, management went to crap too, and in the end they were as bad as the union, but the union started the slide.
Eventually, UAW will kill the Peterbilt plant here too. I'm really surprised they haven't already. They cost Peterbilt millions when they went on strike a few years ago. I was working for a tier one supplier of PACCAR, the company that owns Peterbilt. We were working a solid 65 hours a week making killer money keeping the supply up, because Peterbilt was swamped with orders, and had a SIX MONTH back log. The UAW went on strike over a small increase in benefits, and by the time the strike ended 7 months later, all the orders were cancelled, and diesel went up, so it never really recovered. The Peterbilt employees went back 2 weeks before Christmas for a cut in pay AND in benefits. The union employees got 1st shift back, then went on strike a year later because of the non union employees on 2nd shift.
But then you have poor management that makes everything worse. The tier one supplier I worked for was so poorly managed that they wasted enough to double the wages of every employee on the floor with ease. Management is now filled with idiots with MBA's that have no idea about reality in business. With engineers who have no idea how things actually work. And with short sided accountants who can only see the per part cost of production as they can generate it with book figures that have no basis in reality at all.
Common sense has left BOTH sides, and neither shows signs of finding it again.