Amnesty International reported in 2007 that for cases in which the perpetrator was known , paramilitaries were responsible for 49 % of the attacks against trade - unionists , state forces were responsible for 43 % .
The guerrilla forces were responsible for 2 % .
Amnesty International reported in 2007 that for cases in which the perpetrator was known , paramilitaries were responsible for 49 % of the attacks against trade - unionists , state forces were responsible for 43 % , and the guerrilla forces were responsible for 2 % .