This is the problem, unions are not all the same and around here they get lumped somewhat. I am in a union, the Ironworkers. We get no paid vacations, pay our own medical, pay our own retirement, and are only paid hours we actually work. Holidays are unpaid unless we work on them, rain days, sick days etc. all unpaid. I can be fired or laid off at any time for any reason, there is no seniority (Only one that is pretty safe is the steward) and I'm expected to show up ready to work, on time. Lazy guys don't stay on jobs, people who can't hack it aren't protected, and if you screw up something you will likely be headed down the road that day with no meetings or other HR nonsense.
I get paid well for what I do, but I also am expected to do a good job. We have to get things done faster and generally better to make up for the fact that the companies have to pay us more and thus have to bid based on that. We don't have a single company that we are negotiating with, and thus it is far different from any of the single company unions. It is not exactly free market, but we also can't really dictate anything we want because it is a large number of companies being dealt with and if the bids go too high we won't get the work.
There are issues, especially with the money being paid straight into democrat coffers, and there are picket lines and some other sorts of things from time to time. But in the overall I have never been asked or seen anyone else be asked to damage or destroy anything, threaten anyone, or do anything other than some silly nonsense like walking in front of a truck that has stopped for the picket (But of course only one time because that is what's allowed). Those things are like was said earlier, it feels like a dumb play "Hey guys, we are making a difference by slowing them down" while everyone involved knows it's stupid.
I don't understand the arrogance of some in this thread with talk about holding a gun to the head of the company to demand things. We negotiate with companies, but we do it with a promise that the reason they are paying us is because we will make them money through good, fast work. I know the image of unions is not that, but I take pride in being a professional and doing the right thing to get the job done. We have an apprenticeship to make sure that the people we send out are well trained, and I am dumbfounded hearing about people who feel they are owed the job whether they can do it well or not.