The Baader Meinhof Complex
Covering the early days of the German Red Army Faction (RAF / Rote Armee Fraktion), The Baader Meinhof Complex (also in blu-ray) follows the militant group from student protest days onward to the German Autumn. The movie follows the leaders of the group and while criticized for being centered around them, shows the violence of the group and that period. Trailer is below.
A similar militant group in America, the Weathermen, was also active around the same time. The documentary The Weather Underground follows the the US-based militant group including their bombing of the US capitol.