Unions by always pushing for higher wages without any necessary improvement in worker productivity or efficiency eventually kills the business. Look at US automakers as a perfect example where union wages have long outstripped the value created by their workers or the ability of the company to pass these added costs on to consumers.
In public organizations where there is no bottom line or tangible value for the services provided, unions have pushed so that public employees are often paid many times what a comparable private worker would be paid doing the same job. Hence janitors are making $50,000 per year. This is the problem that is now pushing states and local governments to bankruptcy as taxpayers have reached the limit of what they can pay.
Reminds me of years ago when I was working for a large industrial corporaton as an entry engineer. I was not unionized but the plant workers were very much so. On my first performance review I was asked what were my goals with the company. I told my boss who was high up in management that my objective was to make sure the work I did was at least worth my salary and I really intended to be twice as as valuable as my salary. I’ll always remember the quizzical look on my boss’s face with no reply at all. I’ve always thought it fair to have performance pay for the job. I don’t have much use for unions since my childhood days. To many members think like pack animals without wanting to repay monies given with a marginal increase in value of services.