10 August 1985
Dr. Allan Boesak was arrested and appeared in court on charges of trying to enter a Black township without permit, but charges were subsequently dropped. In the same month, he also planned a march to Pollsmoor Prison in Cape Town, to demand the release of Nelson Mandela. Dr. Boesak was on that occasion detained by police in terms of section 29 of the Internal Security Act, and was taken to Pretoria for interrogation. In March 1985 Dr. Boesak was arrested along with Archbishop Desmond Tutu and Dr Christiaan Beyers Naude, with whom he had formed a triumvirate of South African clerics opposed to the Apartheid regime.
References

Gastrow, S. (1992). Who's Who in South African Politics, no 4, Johannesburg: Ravan.|Alistair Boddy-Evans, 'This week in African history: Key events from the 20th century.', from African History Guide [Online], Available at: africanhistory.about.com, [Accassed: 07 August 2013]