Ukrainian Auxiliary Police in the context of "Ordnungspolizei"

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.

Babi Yar (Russian: Бабий Яр) or Babyn Yar (Ukrainian: Бабин Яр) is a ravine in the Ukrainian capital Kyiv and a site of massacres carried out by Nazi Germany's forces during its campaign against the Soviet Union in World War II. The first and best documented of the massacres took place on 29–30 September 1941, in which some 33,771 Jews were murdered. Other victims of massacres at the site included Soviet prisoners of war, communists and Romanies. It is estimated that a total of between 100,000 and 150,000 people were murdered at Babi Yar during the German occupation.

The decision to murder all the Jews in Kiev was made by the German military governor Generalmajor Kurt Eberhard, the Police Commander for Army Group South, SS-Obergruppenführer Friedrich Jeckeln, and the Einsatzgruppe C Commander Otto Rasch. Sonderkommando 4a as the sub-unit of Einsatzgruppe C, along with the aid of the SD and Order Police battalions with the Ukrainian Auxiliary Police backed by the Wehrmacht, carried out the orders. Sonderkommando 4a and the 45th Battalion of the German Order Police conducted the shootings. Servicemen of the 303rd Battalion of the German Order Police at this time guarded the outer perimeter of the execution site.