In 1937, he became a member of the national branch of Communist Party of Yugoslavia, the newly-formed Communist Party of Croatia, and since then was more engaged in a revolutionary life.
Godine 1937. postao je član nacionalnog ogranka zabranjene i tajne Komunističke partije Jugoslavije - novoosnovane Komunističke partije Hrvatske i od tada se još jače angažira u revolucionarnom životu.