This so-called guerrilas itself were possibly those who were recruited by controversial Operation Gladio or alike, usually right–wing extremists.
This kind of thing was also ever happened in Indonesia during post–killings of 6 MBAD generals. Ali Moertopo was the guy who ran ex DI/TII prisoners, armed them and coordinated them. They got Kerosene (
minyak tanah, refined it little bit and you got aviation turbine fuel (Avtur)) refinery concessions of Cepu, Blora; where Ali Moertopo and his protege Benny Moerdani were born.
Now one of the refinery unit is became PPSDM, PEM Akamigas dormitory (Vyatra) is also there. Owned by the state as Permigan before, headed by PKI sympathizers and one of the way how PKI got their money from. After the
ketok-ketok gulu event, Ibnu Sutowo took it and Vyatra building even had
plakat with his name on it wkwk.