Some 50 friends and supporters of Alfie Meadows and Zak King rallied outside Woolwich Crown Court in south east London on Monday of this week. The two were beginning their third trial.
The pair face charges of violent disorder related to a student protest in Parliament Square on 9 December 2010.
Speakers from the NUT, PCS and CWU unions pledged their solidarity for Alfie and Zak, as did fellow students and lecturers.
The rally was called by Defend the Right to Protest.
Alfie was almost killed by a police baton on the 9 December protest. The trial is expected to last around three weeks.