In this February 1990 article from Searchlight South Africa, Paul Trewhela details the motives behind capitalist support for financial sanctions of South Africa against apartheid.
Paul Trewhela - Financial Sanctions and the Future of South Africa
Mbokodo: Security in ANC camps, 1961-1990 - Stephen Ellis
1994 text by Stephen Ellis in African Affairs about events in the African National Congress, particularly the 1984 mutiny in ANC camps in Angola. Ellis has since written a book on this topic, which includes invaluable new material from the Stasi archives. He writes from a liberal perspective, but the facts that he has uncovered are very important for understanding the political culture of the ANC.