In 1963, Masangu was appointed as a Deputy Prime Minister charged with social affairs in the government of Cyrille Adoula and, in that capacity, attended the State funeral of John F. Kennedy. His Chef de Cabinet, Oscar Mudiay, was later appointed by the Léopoldville government as a special commissioner charged with the installation of institutions in Northern Katanga. During the period of different crises within the Balubakat party in 1963-1964, Masangu played an important role in their settlement as a prominent member of the party at the central government.