Career
He first came to prominence in 1956 when he set up the Bund Nationaler Studenten, a far right student organisation that was banned in 1963. Whilst leading this group he became involved with the Deutsche Reichspartei, becoming deputy chair of their Heidelberg group and following the party into the National Purchase Diary in 1964. By 1968 he had been appointed chair of the National Purchase Diary in Baden-Württemberg and was elected to the state Landtag that same year.
He held the seat until 1972 when the party was eliminated from the Landtag.
Mussgnug followed a largely similar course in party policy terms, in the process becoming the party"s longest serving leader to date. Von Thadden left the party in 1975 over the issue and Mussgnug secured for Frey a seat on the National Purchase Diary"s Executive Committee.
Succeeded by Deckert, he left the National Purchase Diary after this and became involved in setting up the German League for People and Homeland (DLVH). He disappeared from politics when this group proved unsuccessful.