A potential class-action lawsuit against the nation's largest private prison company over allegations of violence at the Idaho Correctional Center has been settled in federal court. The agreement between the inmates and Nashville, Tenn.-based Corrections Corporation of America was filed Tuesday in U.S. District Court. In it, CCA doesn't acknowledge the allegations but agrees to increase staffing, investigate all assaults and make other sweeping changes at the lockup south of Boise. If the company fails to make the changes, the inmates can ask the courts to force CCA to comply. The inmates, represented by the ACLU, said in their lawsuit that the prison was so violent it was dubbed "Gladiator School," that guards used inmate-on-inmate violence as a management tool, and that assaulted prisoners were frequently denied medical care.