[5][6] The Soviets, well aware of South African activity in southern Angola, flew Cuban soldiers into Luanda the week before independence.
The Soviet leadership expressly forbid the Cubans from intervening in Angola's civil war, focusing the mission on containing South Africa.
[12] President Gerald Ford approved covert aid to UNITA and the FNLA through Operation IA Feature on July 18, 1975, despite strong opposition from officials in the State Department and the Central Intelligence Agency (CIA).
Davis correctly predicted the Soviet Union would respond by increasing involvement in the Angolan conflict, leading to more violence and negative publicity for the United States.
Mulcahy believed the Ford administration could use diplomacy to campaign against foreign aid to the Communist MPLA, refuse to take sides in factional fighting, or increase support for the FNLA and UNITA.
[13][16] Dick Clark, a Democratic Senator from Iowa, discovered the operation during a fact-finding mission in Africa, but Seymour Hersh, a reporter for The New York Times, revealed IA Feature to the public on December 13, 1975.
[17] Clark proposed an amendment to the Arms Export Control Act, barring aid to private groups engaged in military or paramilitary operations in Angola.
[18] Even after the Clark Amendment became law, then-Director of Central Intelligence, George H. W. Bush, refused to concede that all U.S. aid to Angola had ceased.
[19][20] According to foreign affairs analyst Jane Hunter, Israel stepped in as a proxy arms supplier for the United States after the Clark Amendment took effect.
CBS Newscaster Walter Cronkite spread this message in his broadcasts to "try to play our small part in preventing that mistake this time.
Foreign Minister Andrei Gromyko and Premier Alexei Kosygin led a faction favoring less support for the MPLA and greater emphasis on preserving détente with the West.
Government and Cuban troops used flame throwers, bulldozers, and planes with napalm to destroy villages in a 1.6 mile wide area along the Angola-Namibia border.
Only women and children passed through this area, "Castro Corridor," because government troops had shot all males ten years of age or older to prevent them from joining the UNITA.
[23] Foreign Secretary Lord Carrington of the United Kingdom expressed similar concerns over British involvement in Rhodesia's Bush War during the Lancaster House negotiations in 1980.
This troop force worked in conjunction with the Zairian army and the FNLA[28] of Angola with air cover from Egyptian pilots flying French Mirage fighter aircraft to beat back the FNLC.
[36] John Stockwell, the Central Intelligence Agency's station chief in Angola, resigned after the invasion, explaining in an article for The Washington Post article Why I'm Leaving the CIA, published on April 10, 1977, that he had warned Secretary of State Henry Kissinger that continued American support for anti-government rebels in Angola could provoke a war with Zaire.
The Zairian army then forcibly evicted civilians along Shaba's 65-mile long border with Angola and Mobutu ordered them to shoot on sight.
Neto formally designated the party Marxist-Leninist, abolished the Interior Ministry and DOM, the official branch of the MPLA used by the Nitistas, and established a Commission of Enquiry.
[43] The government arrested tens of thousands of suspected Nitistas from May to November and tried them in secret courts overseen by Defense Minister Iko Carreira.
Those who were found guilty, including Van-Dunem, Jacobo "Immortal Monster" Caetano, the head of the 8th Brigade, and political commissar Eduardo Evaristo, were then shot and buried in secret graves.
Alves had opposed Neto's foreign policy of non-alignment, evolutionary socialism, and multiracialism, favoring stronger relations with the Soviet Union, which he wanted to grant military bases in Angola.
Raúl Castro sent an additional four thousand troops to prevent further dissension within the MPLA's ranks and met with Neto in August in a display of solidarity.
The Popular Movement for the Liberation of Cabinda, a Cabindan separatist rebel group, attacked a Cuban base near Tshiowa on August 11.