The Walnut Grove Correctional Facility, formerly the Walnut Grove Youth Correctional Facility (WGYCF), was operated as a for-profit state-owned prison in Walnut Grove, Mississippi from 1996 to 2016. Constructed beginning in 1990, it was expanded in 2001 and later, holding male youth offenders. It had an eventual capacity of 1,469 prisoners, making it the largest juvenile facility in the country. Contracts for the facility's operations and services were among those investigated by the FBI in its lengthy investigation of state corruption known as Operation Mississippi Hustle. The prison was one of six for which the state had contracts in the early 21st century with for-profit prison operators; this facility had a record of management problems. A 2010 federal prisoner class-action suit was filed over poor conditions and mistreatment here; it was settled in 2012. Settlement required immediate transfer of youth offenders to a state-run facility meeting juvenile justice standards. The court decree prohibited the state from subjecting any youthful offender to solitary confinement, the first time a federal court had so ruled. In addition, the state changed the mission of WGCF to hold adult prisoners only. The prison had been accredited twice by the American Correctional Association, most recently in 2012. MDOC terminated its contract with GEO Group, replacing it in 2012 with a 10-year contract with another for-profit operator, Management and Training Corporation (MTC), based in Utah. MTC's contract included operation of two other private prisons previously operated by GEO Group. This facility continued to be overseen by a court monitor; oversight was extended by the court after two riots occurred at the prison in 2014. The state closed the prison in September 2016 and is considering its adaptation for other purposes. From 2003 to 2010, the prison was operated for the state by Cornell Companies as a facility for youthful offenders. In 2010 Cornell was acquired by the GEO Group. GEO operated the facility, which housed juvenile prisoners convicted of felonies and sentenced as adults. Two-thirds of the prisoners had been convicted of non-violent offenses. In October 2010, the Department of Justice announced an investigation by the Civil Rights Division into conditions at WGYCF. A separate FBI investigation was started later into the Mississippi prison system related to contracts; extensive corruption was found. As a result of the latter investigation, in November 2014 Christopher Epps resigned as commissioner of the Mississippi Department of Corrections (MDOC), which he had