Currently, 27 states have right-to-work laws that restrict unionization. Last month, a town in Illinois petitioned the Supreme Court to decide whether or not states should be allowed to establish right-to-work laws. One side of the argument is that local officials know what is best for their region economically, and should be able to decide whether or not to allow unionization to occur easily. The other side believes that right-to-work laws ultimately hurt workers and local economies.
See "Local Right-to-Work Laws Could Get Supreme Court Review", Robert Iafolla & Hassan A. Kanu, Bloomberg Law, March 8, 2019