 Initially he worked as editor of the newspaper "Bayerisches Vaterland" ("Bavarian homeland"), and later as director of state funded operations at Süddeutsche Lufthansa, from which he resigned at the beginning of 1930.Arco-Valley was one of the most radical members of the monarchist-federalist wing of the Bavarian People's Party.He was briefly held in "protective custody" by the Nazis when they took power because of his federalism.