Browse an alphabetical list of articles about the Holocaust and World War II. Learn more about topics such as the Nazi rise to power, how and why the Holocaust happened, life in Nazi camps and ghettos, and the postwar trials.
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The Oath of Loyalty for All State Officials started to change in 1934. Learn more about the oath and Germany’s journey from democracy to a Nazi dictatorship.
A Black Sea port in the southwestern Ukraine, Odessa had a population of nearly 600,000 in 1939. Roughly 180,000 were Jews, about 30 percent of the total. Romanian Occupation On June 22, 1941, Nazi Germany and its Axis allies, including Romania, invaded the Soviet Union. In August 1941, Romanian troops set siege to Odessa. The city surrendered on October 16, 1941. At least half of the city's Jewish population had fled Odessa before Axis troops surrounded the city. Between 80,000 and 90,000 Jews remained…
Beginning in 1979, the Office of Special Investigations (OSI) opened hundreds of investigations and initiated proceedings of Nazi war criminals. Learn more
The Ohrdruf camp was a subcamp of the Buchenwald concentration camp, and the first Nazi camp liberated by US troops.
Learn about the rescue activities and the fates of Ona Simaite in Lithuania, Joop Westerweel in the Netherlands, and Irena Sendler in Poland.
Begun as an individual chronicle by Emanuel Ringelblum in October 1939, the Oneg Shabbat underground archive became the secret archive of the Warsaw ghetto.
Learn about Operation “Harvest Festival” (Aktion “Erntefest”), the Nazi attack against the remaining Jews of the Lublin District of the General Government.
Nazi Germany established the killing centers of Belzec, Sobibor, and Treblinka as part of “Operation Reinhard,” the plan to murder all Jews in the General Government.
The Operation Operation Torch was the Anglo-American invasion of French Morocco and Algeria during the North African Campaign of World War II. It began on November 8 and concluded on November 16, 1942. It resulted from an uneasy compromise between the Western Allies, and was intended to relieve pressure on the Soviet Union by imperiling Axis forces in the region and by enabling an invasion of Southern Europe in 1943. Commanded by General Dwight D. Eisenhower, the operation was designed as a pincer…
In 1944, Waffen-SS troops massacred residents of Oradour-sur-Glane, a small village in France. Learn about the German occupation and destruction of the village.
The Oranienburg concentration camp was established as one of the first concentration camps in Nazi Germany on March 21, 1933. Learn more
The Order Police (Ordnungspolizei, Orpo) were Nazi Germany’s uniformed police forces. They became perpetrators of horrific crimes and played a significant role in the Holocaust.
Oskar Schindler's actions to protect Jews during the Holocaust saved over 1,000 Jews from deportation. Learn more about Schindler's List.
Otto Dix was a German artist who depicted the horrors of war. His art was targeted in the Nazi book burnings and “Degenerate Art” exhibition. Learn more.
Social Democratic politician Otto Wels was the only German parliamentary leader to openly oppose passage of the Enabling Act, the cornerstone of Adolf Hitler's dictatorship.
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