 In 1919 Löwenstein joined the right-wing "Wirtschaftsvereinigung zur Förderung der geistigen Wiederaufbaukräfte", a group that was absorbed into the German National People's Party (DNVP).He also participated in the Harzburg Front in 1931.In 1931 he joined "Gesellschaft zum Studium des Faschismus", a group that linked conservatism in Germany with the Nazi Party.