How are the union dues made mandatory? That's important. And, if there is government involvement in that, is there also some regulation involving how unions are

How are the union dues made mandatory? That's important. And, if there is government involvement in that, is there also some regulation involving how unions are expected to behave? Also important. I don't have a problem with recipients of government assistance giving up their right to vote in principal, although America would cease to be a democracy at that point. However I don't think the likely outcome (disenfranchisement of the poor, eventual oppression without any means of placation of said poor, probable rebellion) would be good for society, so I don't think we should do it. Keep in mind, I'm not saying "corporations receive special treatment and so shouldn't be allowed to contribute to political campaigns". I'm saying "corporations receive special treatment, and I have no problem with putting stipulations on that". All I'm arguing against here is the meme that a corporation is "just a group of people". It is not.