Gęsiówka (Polish pronunciation: [ɡɛ̃ˈɕufka]) is the colloquial Polish name for a prison that once existed on Gęsia ("Goose") Street in Warsaw, Poland, and which, under German occupation during World War II, became a Nazi concentration camp. In 1945–56 the Gęsiówka served as a prison and labor camp, operated first by the Soviet NKVD to imprison Polish resistance fighters of the Home Army and other opponents of Poland's new Stalinist regime, then by the Polish communist secret police.