My wife belongs to a public sector union, she doesn't have to belong but it's more a peer pressure thing. I'm fine with collective bargaining and so is she. My only problem is they have to pay $720/year in dues for f**k nothing, goes to the state teachers union which does virtually nothing to help the local union out.
Now my son was forced to join a private sector union (when he was in HS for a min wage job) really pissed me off. Union had a deal with the grocery store that they could not hire a person unless they joined the union... I think his monthly dues were higher than my wifes.