Babi Yar in the context of "Obergruppenführer"

Einsatzgruppen (German: [ˈaɪnzatsˌɡʁʊpm̩], lit. 'deployment groups'; also 'task forces') were Schutzstaffel (SS) paramilitary death squads of Nazi Germany that were responsible for mass murder, primarily by shooting, during World War II (1939–1945) in German-occupied Europe. The Einsatzgruppen had an integral role in the implementation of the so-called "Final Solution to the Jewish question" (Die Endlösung der Judenfrage) in territories conquered by Nazi Germany, and were involved in the murder of much of the intelligentsia and cultural elite of Poland, including members of the Catholic priesthood. Almost all of the people they murdered were civilians, beginning with the intelligentsia and swiftly progressing to Soviet political commissars, Jews, and Romani people, as well as actual or alleged partisans throughout Eastern Europe.

Under the direction of Reichsführer-SS Heinrich Himmler and the supervision of SS-Obergruppenführer Reinhard Heydrich, the Einsatzgruppen operated in territories occupied by the Wehrmacht (German armed forces) following the invasion of Poland in September 1939 and the invasion of the Soviet Union in June 1941. The Einsatzgruppen worked hand-in-hand with the Order Police battalions on the Eastern Front to carry out operations ranging from the murder of a few people to operations which lasted over two or more days, such as the massacre at Babi Yar (with 33,771 Jews murdered in two days), and the Rumbula massacre (with about 25,000 Jews murdered in two days of shooting). As ordered by Nazi leader Adolf Hitler, the Wehrmacht cooperated with the Einsatzgruppen, providing logistical support for their operations, and participated in the mass murders. Historian Raul Hilberg estimates that between 1941 and 1945 the Einsatzgruppen, related agencies, and foreign auxiliary personnel murdered more than two million people, including 1.3 million of the 5.5 to 6 million Jews murdered during the Holocaust.

The Rumbula massacre is a collective term for incidents on November 30 and December 8, 1941, in which about 25,000 Jews were murdered in or on the way to Rumbula forest near Riga, Latvia, during World War II. Except for the Babi Yar massacre in Ukraine, this was the biggest two-day Holocaust atrocity until the operation of the death camps. About 24,000 of the victims were Latvian Jews from the Riga Ghetto and approximately 1,000 were German Jews transported to the forest by train. The Rumbula massacre was carried out by the Nazi Einsatzgruppe A with the help of local collaborators of the Arajs Kommando, with support from other such Latvian auxiliaries. In charge of the operation was Höherer SS und Polizeiführer Friedrich Jeckeln, who had previously overseen similar massacres in Ukraine. Rudolf Lange, who later participated in the Wannsee Conference, also took part in organizing the massacre. Some of the evidence against Latvian Herberts Cukurs is related to the clearing of the Riga Ghetto by the Arajs Kommando. The Rumbula killings, together with many others, formed the basis of the post-World War II Einsatzgruppen trial where a number of Einsatzgruppen commanders were found guilty of crimes against humanity.

The 6th Army (German: 6. Armee) was a field army of the German Army during World War II. It is widely known for its defeat by and subsequent surrender to the Red Army at the Battle of Stalingrad on 2 February 1943. It committed war crimes at Babi Yar while under the command of Field Marshal Walther von Reichenau during Operation Barbarossa.

The 6th Army was reformed in March 1943, and participated in fighting in Ukraine and later Romania, before being almost completely destroyed in the Second Jassy-Kishinev Offensive in August 1944. Following this it would fight in Hungary, attempting to relieve Budapest, and subsequently retreating into Austria in the Spring of 1945. 6th Army surrendered to US Army forces on 9 May 1945.