 Along with South America, Asia entered the market around the 1970s and have played a larger role in supplying drugs to American consumers.The steady demand for illegal drugs by U.S. consumers, which Asian gangs were a significant part of, has led the U.S. government to wage a war on drugs since the 1980s.Gang leader Johnny Eng, otherwise known as "Onionhead", was brought up on charges of masterminding an international heroin importing scheme.