I disagree. Just because your union doesn't like something and wants to picket does NOT mean that everyone you work with agrees with you. Unions have a mafia mentality. Placing people on a list or denying jumpseats is a scare tactic that makes a lot of people support union causes whether they believe in it or not. I personally have flown with several captains that hate the union and their politics but are afraid to withdraw their membership in fear of retaliation (such as things discussed above).
I am not invloving my beliefs in this post. I am not saying whether I personally agree with union issues or not. All I am saying is that people have a right to make their own choices whether you believe in what they do or not.