It had an alliance with the 19th of April Movement , the commanders being brothers .
It was the most violent guerrilla group in the country known for its massacres of the civilian population and by bloody battles with the FARC .
guerrilla group had an alliance with the 19th of April Movement , the commanders being brothers .
It was the most violent guerrilla group in the country known for its massacres of the civilian population and by bloody battles with the FARC .