Friedrich Jeckeln was a German SS commander during the Nazi era. He served as a Higher SS and Police Leader in the occupied Soviet Union during World War II. Jeckeln was the commander of one of the largest groups of Einsatzgruppen death squads and was personally responsible for ordering and organising the deaths of over 100,000 Jews, Romani and others designated by the Nazis as "undesirables". After the end of World War II in Europe, Jeckeln was convicted of war crimes by a Soviet military tribunal in Riga and executed by hanging in 1946.

Einsatzgruppen 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" 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.