Zwelakhe Sisulu is arrested Zwelakhe Sisulu, President of the Black Media Workers Association of South Africa (MWASA), and youngest son of Albertina and Walter Sisulu, was arrested in terms of Section 9 (1) and Section 10 (1) a of the Internal Security Act. This Act provided for unlimited detention without trial. He remained in jail for 251 days. Source:  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.