BOISE, Idaho (AP) — The ACLU of Idaho says Corrections Corporation of America appears to be violating a settlement reached with inmates in a so-called “Gladiator School” lawsuit over violence at an Idaho prison run by the company.

The organization sent CCA a letter last week detailing its concerns about safety at the Idaho Correctional Center south of Boise, executive director Monica Hopkins said. The letter was sent just a day before by a group of inmates filed a separate lawsuit in Boise’s U.S. District Court alleging continued mismanagement and gang violence at the prison.