Here are two links (from skai.gr and BBC Radio 4) on the Greek Military Coup and the resistance to the regime:
1) BBC Radio 4 Witness:
'In April 1967, seven years of military dictatorship began in Greece. During the rule of the colonels, thousands of people were arrested and tortured.
Sociologist Gerasimos Nortaras was part of the armed resistance to the military. He was captured, but refused to give away his fellow fighters, even under brutal torture."
2) Skai.gr article (in Greek)