Following the February Revolution of 1917, Dallin returned to Russia. He won election to the central committee of the Menshevik group of the Russian Social Democratic Labour Party and represented the group on the Moscow City Soviet from 1918 to 1921. The Bolsheviks arrested him a first time in 1920, and he avoided a second arrest in 1922 by fleeing back to Germany. He stayed in Germany until the Nazis forced him to leave in 1935, when he settled in Poland. He stayed in Poland until the outbreak of World War II in 1939, when he moved to the United States.