I have a union story. A friend had a very successful contracting firm. He was making good money and plowing it right back into the company buying equipment and hiring more people. As the company got bigger and was doing more large jobs it got noticed by the union thugs. They went in and pulled their usual lies about making more money, better conditions, more free stuff, and turned it into a union shop. Within a year and a half the company was losing a large enough percentage of bids to have to start laying people off. In the next two year he started going through savings and credit lines to keep the much smaller workforce paid. Then he sold equipment, mostly at a loss, moved into a smaller building, and was still not competitive with non-union shops even losing money on bids. He is now out of business. Did the downturn in the economy play a part? Sure. But his non-union competitors are still in business and even slightly growing. He pegs the decline solely to the unionization of his company. The higher wages, extended benefits, and most importantly the ridiculous work rules made him uncompetitive.
To recap, successful company growing, hiring new employees, and buying equipment gets unionized. Within four years the union sucked all the capital the company had earned out and the company has gone out of business. That was close to forty pretty well paid employees that no longer had jobs. The union killed his company, killed their members jobs, and moved a significant percentage of those productive people on to the government rolls.
I defy anyone to name one single action that a union does to help a company stay in business. Hell name one thing that is not purposefully designed to kill the company.