![A transport of Jewish prisoners marches through the snow from the Bauschovitz train station to Theresienstadt. [LCID: 69720]](https://encyclopedia.ushmm.org/images/large/781755a6-1ba5-4d8e-8b2b-9f25bdf3687f.jpg)
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.
In October 1941, Romania, an ally of Nazi Germany, perpetrated mass killings of Jews in Odesa. Learn more about the Holocaust in Odesa and Ukraine.
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.
Operation Torch was the Allied invasion of French Morocco and Algeria during the North African Campaign of World War II. Learn more.
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.
We would like to thank Crown Family Philanthropies, Abe and Ida Cooper Foundation, the Claims Conference, EVZ, and BMF for supporting the ongoing work to create content and resources for the Holocaust Encyclopedia. View the list of donor acknowledgement.
