Yellow was in massive debt due to poor management decisions and the union fought against a move that would have combined driver seniority lists from various companies they managed, which they suspected was going to be used to cut people's jobs .
The union did what it thought was best for all its members, and the company was in so much debt it couldn't figure out how to fulfill those needs another way.
My point is exactly that the union didn't do what was best for its members because their actions collapsed the company.
Unions are subject to the constraints of operations. LTL is a very debt-heavy industry, and yellow pushed the envelop too far. But the union could have tried to negotiate a contract contingent on operating costs and debt load. They didn't. Instead they chose their line and then striked until the company went under.
Maybe not the best example, but it was the one on my mind.
Looking through the history of the company, it seems like the lack of making a profit for the last 25 years and taking on huge debt may have contributed way more to their demise than anything the union did.
The union did what it thought was best for all its members, and the company was in so much debt it couldn't figure out how to fulfill those needs another way.
This is not a "see unions are bad" example.