Re: How about nonpayment?
Depends upon the contract and the jurisdiction.
Reminds me of something at a former place of work as told to me by the colleague involved, who was hired through an agency. In his normal line of duty, he received a call from that agency with a question about why an overdue invoice for one particular agency worker (himself) wasn't payed yet. His reply: "My salary is already a bit longer overdue". "Oh sh.......".