1973 student uprising against the Greek junta
Source (Wikipedia): Athens Polytechnic uprising

The Athens Polytechnic uprising occurred in November 1973 as a massive student demonstration of popular rejection of the Greek military junta of 1967–1974. It began on 14 November 1973, escalated to an open anti-junta revolt, and ended in bloodshed in the early morning of 17 November after a series of events starting with a tank crashing through the gates of the Athens Polytechnic.