In 1929 he joined the Communist Party of Western Belarus and became secretary of its county committee.
[1] He worked in the underground newspaper of the Central Committee of the Communist Party of Western Ukraine in Lviv.
He was one of the organizers and participants of the Anti-Fascist Congress of Cultural Figures in 1936 in Lviv.
[2] During the period between 1929 and 1939, he was arrested 14 times by the Polish police, and was held twice in the Bereza-Kartuzskaya concentration camp, from which he was liberated by the Red Army in September 1939.
From 1940 he was a member of the Union of Soviet Writers of Ukraine, director of the Lviv branch of the Literary Fund.