That might be your definition, but unions do this also. Maybe it's different in different places - but here the union clearly forbids non-union workers from doing various types of work.

Well, it's not how unions work in Europe, and those unions do not create the kind of problems that American unions apparently create, so maybe the US could learn a lesson from Europe here.

Because the argument "the wrong way is the only right way" makes no sense. If it's wrong, you fix it. Being forced to choose between two wrongs is no good.

Maybe - but clearly advocating for unions in the US when you are in the EU is not the message you intend since unions function differently here.