 During the occupation period he worked for the Dōmei Tsushin in Surabaya.Sutomo became famous by setting up Radio Pemberontakan (Radio Rebellion), which promoted unity and fighting spirit among the Indonesian "pemuda" (youth).During the Japanese occupation, Sutomo was chosen in 1944 as a member of the Japanese-sponsored "Gerakan Rakyat Baru" (New People's Movement).