 Falk had joined Kristiania Arbeidersamfund and the Norwegian Students' Society after moving to Norway, and was also a member of the Norwegian Labour Party.Together with Martin Tranmæl Falk was instrumental in writing the "Kristiania Proposal" in early 1923, which stated that the Labour Party should strive for independency from the Comintern.The Comintern did not take lightly to this, and Falk was present to discuss the issue at the 3rd Enlarged Plenum of Executive Committee of the Communist International in June 1923.