The leaders prosecuting the 1971 April insurrection trail began on 12 June 1972, at the Queen's Club, located at the Baudddhaloka Mawatha, before the Criminal Justice Commission composed of Chief Justice H N G Fernando (Chairman) Justice A C A Alles, Justice V T Thamotheram, Justice H Dheragoda and Justice T W Rajaratnam. Those pleading not guilty were brought in batches before the Commission. The main case consisted of 41 suspects which included Mr Ivan. They were considered to be the main architects of the uprising and the youth rebellion. Ivan and several other rebellions were found guilty and were punished with imprisonments.