Das Personenlexikon zum Dritten Reich / E. Klee. - Frankfurt am Main : S. Fischer, 2003. - p. 198.
SS-Obergruppenführer, lieutenant general of police, and convicted war criminal. After the beginning of the Second World War, Greifelt was appointed Chief of Staff of RKFDV (Reichskommissar für die Festigung deutschen Volkstums; Reich Commissioner for the Consolidation of German Nationhood) in October 1939. He was found guilty of war crimes at the RuSHA trial at Nuremberg, sentenced to life imprisonment, and died in Landsberg Prison.