Comment by rvnx

Then instead of being able to negotiate by yourself or freely pool together with other employees, you will have to go through the union.

Which means it becomes a political game where the union is going to help you only if you help them.

Essentially adding a third-party that lives on the monster.

And then the bosses get used to these unions and they know personally the people who represent the union, etc.

And you end up with a negotiator that will negotiates his own best interests.