guerrilla/guerilla:
(plural: ‘guerrillas‘/’guerillas‘; pronunciation: the letter ‘g’ rhymes with the letter g’ in “garden” — for the right pronunciation of this word, please click here)
a member of an unofficial and secret fighting group which attacks a larger enemy in small groups unexpectedly, and runs away before the enemy recover or take up positions;
a rebel who has taken up weapons,

guerrillas of a guerrilla group at a secret meeting
Benson had been a guerrilla or guerrilla fighter working for a banned activist group that works against the government, but after realising that being a guerrilla would not solve the multitude of social problems, he abandoned the group, and the government gave him protection and a chance to live as a normal citizen.
A guerrilla force usually consists of irregular or unofficial paramilitary members/fighters, called ‘guerrillas’, who use the tactics of attacking their larger and stronger enemy forces without warning and running away before the enemy soldiers get into positions or become alert.
In the present world political scenario, most of the guerillas are educated but unemployed youth who are vexed with the social customs and government policies that prevent them from getting good education, health and employment and have decided to bring changes in the society and in the political systems by taking up weapons and fighting against the governments or whoever they think are against their own policies.
