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The Oath of Loyalty for All State Officials was one of a series of key decrees, legislative acts, and case law in the gradual process by which the Nazi leadership moved Germany from a democracy to a 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.
Approximately 42,000 Jews were killed during Operation "Erntefest," which began at dawn on November
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…
Oradour-sur-Glane was a small farming village of around 350 inhabitants, located near Clermont-Ferrand, some 15 miles west-north-west of Limoges. During World War II, it was located in the German-occupied zone of France. On June 10, 1944, troops of the 2nd Waffen-SS Panzer Division (armored division), Das Reich, massacred 642 people, almost the entire population, and then destroyed the village. After the war, Oradour-sur-Glane rivaled Lidice as an iconic symbol of German crimes against civilians in…
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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