Before that it was Medellin cartel, back then during the golden years of pablo escobar, he control 80% of world market share of cocaine. US government is very unhappy about it. They urge the Colombian government to finalize the extradition law. But Escobar is kind enough to pay off Colombia's national debt + narcoterrorism (Avianca Flight 203 atrocity) the government decided to backdown.