Convict lease
Once they stopped using the convict labor system, many states switched to the trusty system.  This was also a way to save money, but it caused abuses just like the convict labor system did.  Finally, in a landmark case called Gates v. Collier, 501 F.2d 1291 (5th Cir. 1974), a federal court forced the states using the trusty system to stop.