Right to work laws are an intrusion on the free market intended to subvert unions. I'm okay with regulations on the market as long as there's a good reason, but what exactly is the compelling public interest there in blocking this one type of employment contract clause?

Like, employers can require you to do all kinds of things in a contract: wear certain types of clothes, tell you when and where to show up for work, how much you're paid, etc. We regulate some things like health and safety codes because the regulations themselves are clearly in the best interest of the workforce, but who do right-to-work laws ultimately serve?