 From 1919 to 1926 Menghin was a member of Secret Nazi Society Deutsche Gemeinschaft (the German Fellowship), in which he got to know Arthur Seyß-Inquart.In 1932 he participated in the "First International Congress of Prehistoric and Protohistoric Sciences" in London in 1932 with Hugo Obermaier and others.In 1934 he published "Geist und Blut".