He was a member of the Social Democracy of the Kingdom of Poland and Lithuania and Communist Party of Poland. From 1923 to 1937, he was a member of the French Communist Party and even joined its Central Committee. From 1937 in the Soviet Union, he joined the Union of Polish Patriots, Central Bureau of Polish Communists and became the first director of Polpress, a precursor to the Polish Press Agency. Later, he joined the Polish Workers' Party and Polish United Workers' Party, of which he eventually became the member of its Central Committee. He was also a member of the Polish Council of State and a deputy to the State National Council and Legislative Sejm.
- (in Polish) Biuro Edukacji Publicznej IPN "Zygmunt Modzelewski (1900–1954)" – informacja historyczna
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