eager to visit factory and farm workers, publicly praising their governments; privately, he urged the regimes to aid revolutionary movements elsewhere, particularly those fighting the Vietnam War. In September 1973, he returned to Algiers to attend the Fourth Summit of the Non-Aligned Movement (NAM). Various NAM members were critical of Castro's attendance, claiming that Cuba was aligned to the Warsaw Pact and therefore should not be at the conference. At the conference he publicly broke off relations with Israel, citing its government's close relationship with the US and its treatment of Palestinians during the Israel–Palestine conflict. This earned Castro respect throughout the Arab world, in particular from the Libyan leader Muammar Gaddafi, who became a friend and ally. As the Yom Kippur War broke out in October 1973 between Israel and an Arab coalition led by Egypt and Syria, Cuba sent 4,000 troops to aid Syria. Leaving Algiers, Castro visited Iraq and North Vietnam. Cuba's economy grew in 1974 as a result of high international sugar prices and new credits with Argentina, Canada, and parts of Western Europe. A number of Latin American states called for Cuba's re-admittance into the Organization of American States (OAS), with the US finally conceding in 1975 on Henry Kissinger's advice. Cuba's government underwent a restructuring along Soviet lines, claiming that this would further democratization and decentralize power away from Castro. Officially announcing Cuba's identity as a socialist state, the first National Congress of the Cuban Communist Party was held, and a new constitution drafted that abolished the position of president and prime minister. Castro remained the dominant figure in governance, taking the presidency of the newly created Council of State and Council of Ministers, making him both head of state and head of government. Presidency Foreign wars and NAM Presidency: 1975–1979 Castro considered Africa to be "the weakest link in the imperialist chain", and at the request of Agostinho Neto he ordered 230 military advisers into Angola in November 1975 to aid Neto's Marxist MPLA in the Angolan Civil War. When the US and South Africa stepped up their support of the opposition FLNA and UNITA, Castro ordered a further 18,000 troops to Angola, which played a major role in forcing a South African and UNITA retreat. The decision to intervene in Angola has been a controversial one, all the more so as Castro's critics have charged that it was not his decision at