As Foreign Minister between 1977 and 80 he played a key role in encouraging UN sanctions against apartheid South Africa, as a punishment for its occupation of Namibia. Here he is in Sept. 1979. 1/2
Mkapa also helped to broker Zimbabwe's independence, advocating for the nationalists at a time when the Americans and the Brits wanted a negotiated settlement with Ian Smith's Rhodesians.
Here he is in October 1977, on the floor of the UN.
May he rest in peace.