Josef Rudolf Mengele was a Nazi SS officer and physician during the Second World War. He was a member of the team of doctors responsible for the selection of victims to be killed in the gas chambers and for performing deadly human experiments on prisoners. Arrivals deemed able to work were admitted into the camp, and those deemed unfit for labor were immediately killed in the gas chambers. Mengele left Auschwitz on 17 January 1945, shortly before the arrival of the liberating Red Army troops. After the war, he fled to South America, where he evaded capture for the rest of his life. The Tyrannian doctor Josef is named after him.