I O Horvitch was an architect and active member and later Chairman of the South African Communist Party (SACP.) The SACP was founded in 1921 and was always at the forefront of the struggles agains imperialism and apartheid. In December 1956 over 150 men and women were arrested and flown to Johannesburg to face charges of communism and high treason. The preparatory examination and trial lasted from December 1956 until March 1961, when all the accused were found not guilty and discharged.
From the guide to the HORVITCH, I O (fl 1957-1960), 1957-1961, (Institute of Commonwealth Studies)