In April 1944, Erich Ehrlinger took over as department chief. Amt II, "Ideological Investigation", headed by SS-Brigadeführer Professor Franz Six.[11] Amt III, "Spheres of German Life" or the Inland-SD, headed by SS-Gruppenführer Otto Ohlendorf, was the SS information gathering service for inside Germany.[11] It also dealt with ethnic Germans outside of Germany's prewar borders, and matters of culture. Amt IV, "Suppression of Opposition", formed from Abteilung II and III of the Gestapa (better-known by the "sobriquet" Gestapo),[15] headed by SS-Gruppenführer Heinrich Müller.[16] SS-Obersturmbannführer Adolf Eichmann, one of the main architects of the Holocaust, was head of the Amt IV sub-department called Referat IV B4.[17] Amt V, "Suppression of Crime" Kriminalpolizei (Kripo), originally led by SS-Gruppenführer Arthur Nebe[18] and later by SS-Oberführer Friedrich Panzinger.[19] This was the Criminal Police, which dealt with non-political serious crimes, such as rape, murder, and arson.