This article by Ken Keable appeared in the Guardian "Comment is free" section on 24th August 2012.
After Nelson Mandela and other leaders of the African National Congress were jailed in 1964, almost all ANC members who were not in prison or under severe internal restriction had to go into exile to evade arrest and torture.
Once out of immediate danger, they then had another problem: how could they continue the struggle against the apartheid regime? How could they show the people that the ANC was not defeated? The ANC's four-man London leadership found an answer. They began recruiting young, white, non-South African men and women, unknown to the regime, who could enter South Africa without arousing suspicion. I was one of those London recruits.