Gustav Schreiber was a Hauptscharführer (Sergeant first class) in the Waffen SS during World War II who was awarded the Knight's Cross of the Iron Cross, which was awarded to recognize extreme battlefield bravery or successful military leadership by Nazi Germany during World War II.
Gustav Hermann Sorge (April 24, 1911, Rydzyna, Silesia – 1978, Rheinbach, prison), nicknamed "Der eiserne Gustav" (The Iron Gustav) for his brutality, was an SS-Hauptscharführer and a guard at Esterwegen concentration camp in the Emsland region of Germany prior to being assigned to Sachsenhausen concentration camp.