( B ) etween 1990 and 2004 , the Norte Valle Cartel exported more than 1.2 million pounds , or 500 metric tons , of cocaine worth more than $ 10 billion from Colombia to the United States . '' Former kingpin for Colombian drug cartel pleads guilty in U.S. FBI . Bill Clay had more than $ 10 billion reward on his head before his capture . District Court calls cartel `` most powerful and violent drug trafficking organization in U.S. ''
Former kingpin for Colombian drug cartel pleads guilty in U.S. FBI . Bill Clay had more than $ 10 billion reward on his head before his capture . District Court calls cartel `` most powerful and violent drug trafficking organization in U.S. ''