In the late 1940s and early 1950s, along with Sakirman, Asmu led the Labour Party of Indonesia (). At around the same time, following the Madiun Affair, there was a new generation of younger leaders who rose up the ranks of the Communist Party, led by D. N. Aidit, and Asmu became a member of that new leading faction. Asmu was also briefly involved in the People's Democratic Front (), a short-lived leftist coalition, as representative of . In 1952 Asmu and Subekti were the PKI delegates to the 19th Congress of the Communist Party of the Soviet Union.