There are folks that are radically pro-union and others that have positive attitudes toward unions. Given the actions of the Wisconsin Governor and Legislature as well as Bills in other states Pro-Union protesters and some very radical people are almost participating in riots.
For those of you who are very pro-union please note I've been on both sides. I've worked in management, during my career, all the time maintaining my Union Dues from when I was a worker. Even though I paid those dues I never got even the right to vote from them all because I was working in Supervision.
The question below is prompted because I have seen many advocate boycotting a Restaurant because it's building was built without Union labor or they don't hire Union workers. For those I have a question