How do you call an armed formation that murders more civilians than enemy soldiers?
This...
Same problem with the Ukrainian Insurgent Army, which seemed to excel mostly in killing women and old men. Same problem with the Chechen "independence" fighters, that post-1999 killed a lot more school-age children and theater goers, than Russian soldiers.
FARC in Colombia, always seemed to me to be more interested in terrorizing innocents and controlling the narcotics trade, than fighting the Colombian military.
Come to think of it, it also applies to the US occupation-era Afghan Army, which killed a lot more innocent Afghans than Taliban fighters.
The opposite of this, would probably be organizations like ETA in the Basque Country, the Real IRA, Brigate Rosse in Italy, and the Rote Armee Fraktion in Germany. These seemed to put a good deal of effort into avoiding civilian casualties, and instead actually targeting government officials, police, and military.