The Holocaust in Estonia in the context of Klooga concentration camp

The history of the Jews during World War II is almost synonymous with the persecution and murder of Jews which was committed on an unprecedented scale in Europe and European North Africa (pro-Nazi Vichy-North Africa and Italian Libya). The massive scale of the Holocaust which happened during World War II greatly affected the Jewish people and world public opinion, which only understood the dimensions of the Final Solution after the war. The genocide, known as HaShoah in Hebrew, aimed at the elimination of the Jewish people on the European continent. It was a broadly organized operation led by Nazi Germany, in which approximately six million Jews were murdered methodically and with horrifying cruelty. Although the Holocaust was organized by the highest levels of the Nazi German government, the vast majority of Jews murdered were not German, but were instead residents of countries invaded by the Nazis after 1938. Of the approximately 6 million Jews murdered by the Nazis, approximately 160,000 to 180,000 were German Jews. During the Holocaust in occupied Poland, more than one million Jews were murdered in gas chambers of the Auschwitz concentration camp alone. The murder of the Jews of Europe affected Jewish communities in Albania, Austria, Belarus, Belgium, Bosnia & Herzegovina, Channel Islands, Croatia, Czech Republic, Estonia, France, Germany, Greece, Hungary, Italy, Latvia, Libya, Lithuania, Luxembourg, Moldova, the Netherlands, North Macedonia, Norway, Poland, Romania, Russia, Serbia, Slovakia, and Ukraine.

Leading to World War II, nearly all Jewish businesses in Nazi Germany had either collapsed under financial pressure and declining profits, or had been forced to sell out to the Nazi German government as part of the "Aryanization" policy inaugurated in 1937. As the war started, massacres of Jews took place originally as part of Operation Tannenberg against the Polish nation. The much larger and methodical mass killings of Jews began with the onset of Operation Barbarossa in 1941. Led by Einsatzgruppen and the Order Police battalions, the destruction of European Jews took place with the active participation of local Auxiliary Police including Belarusian, Estonian, Latvian, Lithuanian, and Ukrainian units.

The Holocaust saw the genocide of at least 2 million Soviet Jews by Nazi Germany, Romania, and local collaborators during the German-Soviet War, part of the wider Second World War. It may also refer to the Holocaust in the Baltic states (Estonia, Latvia, and Lithuania), and Soviet Moldova, recently annexed by the Soviet Union before the start of Operation Barbarossa, in the Soviet republics Belarus, Ukraine, and parts of Russia, as well as other groups murdered in the invasion (such as Roma, Soviet POWs, and others).

The launch of Germany's "war of extermination" against the Soviet Union in June 1941 marked a turning point in the country's anti-Jewish policy from expulsion to mass murder; as a result, it is sometimes seen as marking the beginning of the Holocaust. At the start of the conflict, there were estimated to be approximately five million Jews in the Soviet Union of whom four million lived in the regions occupied by Nazi Germany in 1941 and 1942. The majority of Soviet Jews murdered in the Holocaust were killed in the first nine months of the occupation during the so-called Holocaust by Bullets. Approximately 1.5 million Jews succeeded in fleeing eastwards into Soviet territory; it is thought that 1.152 million Soviet Jews had been murdered by December 1942. In total, at least 2 million Soviet Jews were murdered.