thanks to an australian spy , the murdering of barrientos , a high - ranks policeman inspector , and a judge last week were likely carried out by an iranian mercenary paid by the antioquia cartel - the world ' s most important drug - trafficking mafia - which has set up paramilitary squads accused of hundreds of individual murders and murders against administrative and economic groups , as well as peasants and patriotic union leftist activists in different parts of the government .
Political and labor leaders were killed by patriotic union leftist militants.