Happens all over the place. You choose a profession and then need the governments permission to actually work in it. And they usually charge you for the privilege of being allowed to work in your chosen profession. Might be something as simple as washing hair in a salon or as complex as being an EMT, but you still have to get their permission to work. Some places are worse than others for it, too. Hopefully we'll get government out of this business one of these days, but I'm not going to hold my breath on it.
Getting the Government’s Permission to Work | The Agitator
http://www.youtube.com/watch?feature=player_embedded&v=Jr8qHv4hCVw
Yet you advocate for the state's involvement in matters involving unions between individuals.
Amazing.