After the 1971 coup d'état, the Ziverbey villa in Erenköy, Istanbul was used to interrogate Turkish communists. The mastermind behind Ziverbey interrogations was brigadier general Memduh Ünlütürk, working under Lieutenant General Turgut Sunalp, who was reporting to the Commander of the First Army, General Faik Türün. The latter two generals were Korean War veterans who had served in the Operations Department (). The interrogation techniques they used in Ziverbey were inspired by what they had seen done to Korean and Chinese POWs during the Korean War. Prisoners were bound and blindfolded.