The Holocaust was the systematic mass murder of European Jews and other groups by Nazi Germany between 1933-1945. Adolf Hitler rose to power in Germany and became dictator in 1933, at which point he began enacting anti-Semitic laws to persecute Jews. Eventually, concentration camps were established where prisoners were forced into hard labor and many were killed. The largest camp was Auschwitz, where over 1 million people were murdered. In total, approximately 11 million innocent people were killed in the Holocaust before Allied forces began liberating the camps in 1944-1945.