The Holocaust in Estonia refers to the Nazi crimes during the occupation of Estonia by Nazi Germany. Prior to the war, there were approximately 4,300 Estonian Jews. After the Soviet 1940 occupation about 10% of the Jewish population was deported to Siberia, along with other Estonians. About 75% of Estonian Jews, aware of the fate that awaited them from Nazi Germany, escaped to the Soviet Union; virtually all of those who remained (between 950 and 1,000 people) were killed by Einsatzgruppe A and local collaborators before the end of 1941. Roma people of Estonia were also murdered and enslaved by the Nazi occupiers and their collaborators. The Nazis and their allies also killed around 6,000 ethnic Estonians and 1,000 ethnic Russians who were accused of being communist sympathizers or the relatives of communist sympathizers. In addition around 25,000 Soviet prisoners of war and Jews from other parts of Europe were killed in Estonia during the German occupation.
Prior to World War II, Jewish life flourished with the level of cultural autonomy accorded being the most extensive in all of Europe, giving full control of education and other aspects of cultural life to the local Jewish population. In 1936, the British-based Jewish newspaper The Jewish Chronicle reported that "Estonia is the only country in Eastern Europe where neither the Government nor the people practice any discrimination against Jews and where Jews are left in peace and are allowed to lead a free and unmolested life and fashion it in accord with their national and cultural principles."
Round-ups and killings of the remaining Jews began immediately as the first stage of Generalplan Ost which would require the "removal" of 50% of Estonians. Undertaken by the extermination squad Einsatzkommando (Sonderkommando) 1A under Martin Sandberger, part of Einsatzgruppe A led by Walter Stahlecker, who followed the arrival of the first German troops on July 7, 1941. Arrests and executions continued as the Germans, with the assistance of local collaborators, advanced through Estonia. Estonia became a part of the Reichskommissariat Ostland. A Sicherheitspolizei (Security Police) was established for internal security under the leadership of Ain Mere in 1942. Estonia was declared Judenfrei quite early by the German occupation regime at the Wannsee Conference. Jews that had remained in Estonia (929 according to the most recent calculation) were killed. Fewer than a dozen Estonian Jews are known to have survived the war in Estonia.