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pedestrianobservations.com
pedestrianobservations.com
Using loaded terms in your writing is a good way to lose readers.
However, there were others, and e.g. 2. June Movement were "anarchist".
But if one were to clump together all of the terror groups involved, what should they be labelled? On the political continuum all these were pretty much on the far left. Not only that, the groups clearly sympathized with the USSR and its communist (Marxist-Leninist) ideology, and were supported in some way through the instruments of USSR (like KGB) or by their proxies (like Stasi of East Germany).
Calling these groups "communist terror groups" is a rather descriptive term.