I do not recall hearing the word insurgency applied during the Greek up risings of 1941-1949, but it would have been an accurate term. They were directed against constituted authority in every case.
Rankin, Karl L.
"Communist Insurgency in Greece,"
Naval War College Review: Vol. 15:
6, Article 2.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol15/iss6/2