The coup leaders, joined by Awadallah, the former chief justice who had been privy to the coup, constituted themselves as the ten-member Revolutionary Command Council (RCC), which posssessed collective executive authority under Nimeiri's chairmanship. On assuming control, the RCC proclaimed thÍÍÍÍe establishment of a "democratic republic" dedicated to advancing independent "Sudanese socialism." The RCC's first acts included the suspension of the Transitional Constitution, the abolition of all government institutions, and the banning of political parties. The RCC also nationalized many industries, businesses, and banks. Furthermore, Nimeiri ordered the arrest of sixty-three civilian politicians and forcibly retired senior army officers.

Awadallah, appointed prime minister to form a new government to implement RCC policy directives, wanted to dispel the notion that the coup had installed a military dictatorship. He presided over a twenty-one-member cabinet that included only three officers from the RCC, among them its chairman, Nimeiri, who was also defense minister. The cabinet's other military members held the portfolios for internal security and communications. Nine members of the Awadallah regime were allegedly communists, including one of the two southerners in the cabinet, John Garang, minister of supply and later minister for southern affairs. Others identified themselves as Marxists. Since the RCC lacked political and administrative experience, the communists played a significant role in shaping government policies and programs. Despite the influence of individual SCP members, the RCC claimed that its cooperation with the party was a matter of convenience.

In November 1969, after he claimed the regime could not survive without communist assistance, Awadallah lost the prime ministership. Nimeiri, who became head of a largely civilian government in addition to being chief of state, succeeded him. Awadallah retained his position as RCC deputy chairman and remained in the government as foreign minister and as an important link with leftist elements.

Conservative forces, led by the Ansar, posed the greatest threat to the RCC. Imam Al Hadi al Mahdi had withdrawn to his Aba Island stronghold (in the Nile, near Khartoum) in the belief that the government had decided to strike at the Ansar movement. The imam had demanded a return to democratic government, the exclusion of communists from power, and an end to RCC rule. In March 1970, hostile Ansar crowds prevented Nimeiri from visiting the island for talks with the imam. Fighting subsequently erupted between government forces and as many as 30,000 Ansar. When the Ansar ignored an ultimatum to surrender, army units with air support assaulted Aba Island. About 3,000 people died during the battle. The imam escaped only to be killed while attempting to cross the border into Ethiopia. The government exiled Sadiq al Mahdi to Egypt, where Nasser promised to keep him under guard to prevent him from succeeding his uncle as head of the Ansar movement.

After neutralizing this conservative opposition, the RCC concentrated cfdon consosolidating its political organization to phase out communist participation in the government. This strategy prompted an internal debate within the SCP. The orthodox wing, led by party secretary general Abd al Khaliq Mahjub, demanded a popular front government with communists participating as equal partners. The National Communist wing, on the other hand, supported cooperation with the government.

Soon after the army had crushed the Ansar at Aba Island, Nimeiri moved against the SCP. He ordered the deportation of Abd al Khaliq Mahjub. Then, when the SCP secretary general returned to Sudan illegally after several months abroad, Nimeiri placed him under house arrest. In March 1971, Nimeiri indicated that trade unions, a traditional communist stronghold, would be placed under government control. The RCC also banned communistaffiliated student, women's, and professional organizations. Additionally, Nimeiri announced the planned formation of a national political movement called the Sudan Socialist Union (SSU), which would assume control of all political parties, including the SCP. After this speech, the government arrested the SCP's central committee and other leading communists.

The SCP, however, retained a covert organization that was not damaged in the sweep. Before further action could be taken against the party, the SCP launched a coup against Nimeiri. The coup occurred on July 19, 1971, when one of the plotters, Major Hisham al Atta, surprised Nimeiri and the RCC meeting in the presidential palace and seized them along with a number of proNimeiri officers. Atta named a seven-member revolutionary council, in which communists ranked prominently, to serve as the national government. Three days after the coup, however, loyal army units stormed the palace, rescued Nimeiri, and arrested Atta and his confederates. Nimeiri, who blamed the SCP for the coup, ordered the arrest of hundreds of communists and dissident military officers. The government subsequently executed some of these individuals and imprisoned many others.

Having survived the SCP-inspired coup, Nimeiri reaffirmed his commitment to establishing a socialist state. A provisional constitution, published in August 1971, described Sudan as a "socialist democracy" and provided for a presidential form of government to replace the RCC. A plebiscite the following month elected Nimeiri to a six-year term as president.

Data as of June 1991