"Locked up by the Colonels"
by cm

Flag of Greece (1970-1975)
Public DomainFlag of Greece (1970-1975)
The history of modern Greece includes a period of dictatorship from 1967 to 1974.  This was known as the Regime of the Colonels.  The Junta, backed by the US, locked up thousands of political opponents and brought tanks onto the streets of Athens.

They even changed the Greek flag to a darker shade of blue.