13-18 November 1973 the Athens Polytechnic university was occupied by students protesting against the US supported junta in Greece, wanting NATO out and better living conditions.
The most famous chants were "US out, NATO out" and "Bread, Education, Freedom" (translated).
As of today, the police forces started becoming violent and the first innocent people had died.
The following two days martial law was declared and police with the army were beating and shooting at anyone outside of their homes.
In total, 34 innocent people were killed and 1103 were injured, though the numbers are still very uncertain.
Less than a year later, the junta ended giving place to parliamentary democracy. Many factors led to its fall, most notably its failure in politics surrounding Cyprus that led to the Turkish invasion, but the uprising and public opinion was surely another major factor.
Every year those days are kept in memory especially by the communist party KKE and communist youth KNE. Tommorow a protest will be taking place towards the US embassy against imperialism.
Oh yeah, I didn't mean to imply that- there was all sorts of street violence going on from the martial law.