From September to November 1939 he was deputy head of the press and propaganda department of the Executive Committee of the Comintern.
[2] From 7 March 1947 to 15 February 1949 Iovchuk served as Secretary of the Central Committee of the Communist Party of Belarus (b) for propaganda and agitation.
From 1949 to 1953 he was head of the Department of Dialectical and Historical Materialism at the Ural State University in Sverdlovsk.
From 1966 he was Chairman of the Scientific Council of the USSR Academy of Sciences on the History of Public Opinion.
[3] From October 1970 to March 1978 he was rector of the Academy of Social Sciences under the Central Committee of the CPSU.