(Al-Jazeera) The FBI has launched an investigation into the Corrections Corporation of America (CCA) over the way it runs an Idaho prison that has such a reputation for violence that inmates dub it “Gladiator School.”

The Nashville, Tenn.-based CCA has operated Idaho’s largest prison for more than a decade, but last year, CCA officials acknowledged it had understaffed the Idaho Correctional Center by thousands of hours in violation of the state contract. CCA also said employees falsified reports to cover up the vacancies. The announcement came after an Associated Press investigation showed CCA sometimes listed guards as working 48 hours straight to meet minimum staffing requirements.

In January, Idaho officials announced the prison may be handed over to state control because of its staffing issues.

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