Auschwitz I was first constructed to hold Polish political prisoners, who began to arrive in May 1940. The first extermination of prisoners took place in September 1941, and Auschwitz II–Birkenau went on to become a major site of the Nazi “Final Solution to the Jewish question”.
In the course of the war, the camp was staffed by 7,000 members of the German Schutzstaffel (SS), approximately 12 percent of whom were later convicted of war crimes. Some, including camp commandant Rudolf Höss, were executed. The Allied Powers refused to believe early reports of the atrocities at the camp, and their failure to bomb the camp or its railways remains controversial. One hundred forty-four prisoners are known to have escaped from Auschwitz successfully, and on October 7, 1944, two Sonderkommando units—prisoners assigned to staff the gas chambers—launched a brief, unsuccessful uprising.
As Soviet troops approached Auschwitz in January 1945, most of its population was evacuated and sent on a death march. The prisoners remaining at the camp were liberated on January 27, 1945, a day now commemorated as International Holocaust Remembrance Day. In the following decades, survivors, such as Primo Levi, Viktor Frankl, and Elie Wiesel, wrote memoirs of their experiences in Auschwitz, and the camp became a dominant symbol of the Holocaust.