In its campaign to take power from the white government, South Africa's black majority has two main weapons: mass protest and international pressure. Most economic and sports sanctions imposed from abroad have now been lifted -- as South Africa's participation in the Barcelona Olympics attests -- so Nelson Mandela and his African National Congress have increased their efforts at home.
After a two-day general strike by millions of black workers last week, the A.N.C. and its allies in the trade unions and the Communist Party turned up the heat with marches in several cities. Most dramatic was the peaceful turnout in...