Friedrich-Wilhelm Krüger was a German paramilitary commander in charge of, and personally involved in progressive annihilation of the Polish nation, its culture, its heritage and its wealth. Long before the war he was a high-ranking member of the SA and the SS. Between 1939 and 1943 he was the Higher SS and Police Leader in the General Government, giving him command of all police and security forces in German-occupied Poland. In this capacity, he organized and supervised numerous crimes against humanity and had major responsibility for the German genocide of the Polish nation: the extermination of six million Poles and massive destruction, degradation and impoverishment of the Polish state. He committed suicide in May 1945.

Obergruppenführer was a paramilitary rank in Nazi Germany that was first created in 1932 as a rank of the Sturmabteilung (SA) and adopted by the Schutzstaffel (SS) one year later. Until April 1942, it was the highest commissioned SS rank after only Reichsführer-SS. Translated as "senior group leader", the rank of Obergruppenführer was senior to Gruppenführer. A similarly named rank of Untergruppenführer existed in the SA from 1929 to 1930 and as a title until 1933. In April 1942, the new rank of SS-Oberst-Gruppenführer was created which was above Obergruppenführer and below Reichsführer-SS.