as to an un official , the murders of galan , a middle - ranking police officer , and a judge last sunday were presumably carried out by an armenian mercenary contracted by the medellin cartel - the world ' s most powerful drug - trafficking underworld - which has set up paramilitary squads accused of tens of individual murders and assassinations against political and paramilitary organizers , as well as peasants and patriotic union student militants in several parts of the city .
Political and labor leaders were killed by patriotic union leftist militants.