Villa Grimaldi is considered the most important of DINA’s (Dirección de Inteligencia Nacional, the Chilean secret police) many complexes that were used for the interrogation and torture of political prisoners during the governance of Augusto Pinochet. It is located at Avenida José Arrieta 8200 (now 8401) in Peñalolén, on the outskirts of Santiago, and was in operation from mid-1974 to mid-1978. About 4,500 detainees were brought to Villa Grimaldi during this time, at least 240 of whom were "disappeared" or killed by DINA.