Without doubt MT these sort of things do go on, and maybe unions have in the past, and now, get a little out of hand, but so does the employer also.
I remember when I was very young, and the place I went to work, was told that I had to join the union, I said I didn't want to, mainly because I had to pay a monthly premium to them. My wage was already very low so wanted to hang on to it all.
I didn't join, but for months many of the other workers would talk to me because I hadn't. ?