Eh, the top complaint I have heard from people who are union members is that they take money for very little.
There are bad unions out there, but I don't think they're a majority.
For example, it may be illegal for public servants to strike. The government may not go out of “business”. Civil servants tend to skew towards white collar professions. Point being, there are a different set of incentives and tactics in pubic vs private unions
I wish I was in a union now.