He held his dictatorial power until 1973, when he was himself overthrown by his co-conspirator Dimitrios Ioannidis.
Papadopoulos was a Colonel of the Artillery.
During World War II, he initially resisted the Italian 1940 invasion but later became an active Axis collaborator in the Security Battalions which "hunted down" Greek resistance fighters.
He underwent military and intelligence training in the United States during the 1950s, and had connections to the CIA.