The Reverend Dr. Arthur William Blaxall, an Anglican clergyman, was convicted on charges of aiding the activities of the African National Congress (ANC) and the Pan-Africanist Congress (PAC). He pleaded guilty and did not appeal against the sentence. However, on instructions from Prime Minister B.J.Vorster he was released on parole the following day.

References:

Kalley, J.A.; Schoeman, E. & Andor, L.E. (eds)(1999). Southern African Political History: a chronology of key political events from independence to mid-1997, Westport: Greenwood.

http://www.sahistory.org.za/pages/chronology/main-chronology-1960s.html