Martin Sommer

Walter Gerhard Martin Sommer (8 February 1915 – 7 June 1988) was a German SS Hauptscharführer (master sergeant) who served as a guard at the concentration camps of Dachau and Buchenwald. Sommer, known as the "Hangman of Buchenwald", was considered a depraved sadist who reportedly ordered two Austrian priests, Otto Neururer and Matthias Spanlang, to be crucified upside-down. Provided by Wikipedia