I think you’re talking about “at-will” employment, which allows the employer or employee to terminate employment for no reason at any time. Only Montana doesn’t have that (unfortunately for the rest of us), and employers must show good cause for termination after a set probationary period. “Right-to-work” means that you can’t be required to join a union or pay fair share fees as a requirement of employment. 26 states have this on the books.

I live in a state with both laws, and it sucks as much as you’d imagine… (mainly because it’s fairly indicative of other issues throughout the state).