Thousands marched through central London on 21 October 1978 to mark International Anti-Apartheid Year. They protested against the massacre of Zimbabwean refugees in Zambia by white Rhodesian security forces and called for international sanctions against the Rhodesian and South African regimes. At a rally in Trafalgar Square, Angolan ambassador, Luis de Almeida, pledged solidarity with freedom fighters in Namibia, Zimbabwe and South Africa.