By the late 1970s, Interior Minister Nito Alves had become a powerful member of the MPLA government. Alves had successfully put down Daniel Chipenda's Eastern Revolt and the Active Revolt during Angola's War of Independence. Factionalism within the MPLA became a major challenge to Neto's power by late 1975 and Neto gave Alves the task of once again clamping down on dissent. Alves shut down the Cabral and Henda Committees while expanding his influence within the MPLA through his control of the nation's newspapers and state-run television. Alves visited the Soviet Union in October 1976, and may have obtained Soviet support for a coup against Neto. By the time he returned, Neto had grown suspicious of Alves' growing power and sought to neutralize him and his followers, the Nitistas. Neto called a plenum meeting of the Central Committee of the MPLA. Neto formally designated the party as Marxist-Leninist, abolished the Interior Ministry (of which Alves was the head), and established a Commission of Enquiry. Neto used the commission to target the Nitistas, and ordered the commission to issue a report of its findings in March 1977. Alves and Chief of Staff José Van-Dunem, his political ally, began planning a coup d'état against Neto.