Power needs to be checked. This could be a person managing the local union (they are elected) .. or a corporate fat cat whose whole point of existence is to cut corners. If you are relying on the good will of corporate America.. or even more laughable bureaucratic legislation then you are either blind or kidding yourself. There are laws in place for certain safety issues, but even today people often let things go for fear of retribution. If you've ever held a management position in a big company then you know there is no such thing as anonymous.
Teamsters do not force you to join. That is up to the state. In fact most workers don't even know if you have joined or not. When I was a supervisor I would discipline employees and the union stewards would sit in even though the person getting written up wasn't even a union member. It was kinda funny tbh.Those that force workers to unionize in order to gain employment are generally frowned upon (Teamsters/UAW/etc are examples of this).
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