sentences:  The Colombian mafias and especially the Medellín Cartel imposed a modality of crime with the hired killers ("sicarios" in Spanish) to murder political opponents or any authority that could put in danger their dirty business.What became astonishing was that the mafias were contracting teenagers from the slums of the big cities.Boys from marginalized barrios (and many cases also girls), became killing machines ready to murder for the service of the mafias.