Walter Max Ulyate Sisulu was a South African anti-apartheid activist and member of the African National Congress (ANC). Between terms as ANC Secretary-General (1949–1954) and ANC Deputy President (1991–1994), he was Accused No.2 in the Rivonia Trial and was incarcerated on Robben Island where he served more than 25 years' imprisonment for his anti-Apartheid revolutionary activism. He had a close partnership with Oliver Tambo and Nelson Mandela, with whom he played a key role in organising the 1952 Defiance Campaign and the establishment of the ANC Youth League and Umkhonto we Sizwe. He was also on the Central Committee of the South African Communist Party.