A high court judge says the Boeremag aimed to destroy democracy when it planted bombs, condemning six members to effectively 25 years in prison.
Tom Vorster, who played a leading role in planning a right-wing coup, has become the tenth accused to be convicted of treason.
The Boeremag treason trial has hit another snag, which may see even more tax money spent on the defence of the accused.
The judge in the Boeremag treason trial on Tuesday urged one of the accused and his legal representative to come to some sort of arrangement after the advocate withdrew from the trial, causing yet a further delay. Advocate Barry van der Merwe, who represented alleged former Boeremag military commander Tom Vorster, withdrew without giving any reasons.