The outbreak of the Second World War in Europe found him in Moscow again, and he remained for the duration of the war. After the dissolution of the Communist International in 1943, he was in charge of propaganda directed at enemy forces and prisoners of war. Gerő was among the first communist functionaries to return to Hungary in early November 1944. He was a member of Hungary's High National Council (provisional government) between 26 January and 11 May 1945.
