Eng was arrested at least five times in the 1970s. In 1983, Eng became the leader of the Flying Dragons. By 1988 he had moved into the heroin trade in Manhattan's Chinatown. A confidential report issued by the Justice Department called Eng "one of the five major heroin dealers in New York City." A native of Hong Kong, Eng was 31 years old in 1989, when he fled to that city to avoid arrest and prosecution. He was arrested there in 1989. Eng fought extradition for nearly three years, but was brought to the United States in 1991. In December 1992, Eng was convicted of 14 counts of heroin smuggling and conspiracy.
In March 1993, Eng was sentenced to 24 years in prison and fined $3,500,000 by Federal District Court judge Reena Raggi. The government also confiscated Eng's 200 acre estate in Pennsylvania, which was reported to have been used for machine gun practice by members of the Flying Dragons. He was released several years early on 8 November 2010.
- Butterfield, Fox (4 Mar 1989). "A New Gang's Violent Role in Chinatown". New York Times: 29.
- Chin, Ko-lin (16 February 2000). Chinatown Gangs: Extortion, Enterprise, and Ethnicity. Oxford University Press. p. 153. ISBN 978-0-19-513627-2. Retrieved 21 October 2011.
- Lubasch, Arnold H. (15 December 1992). "Ex-Head of Chinatown Gang Is Guilty of Leading Drug Ring". New York Times: B3.
- Faison, Seth (12 April 1994). "Chinatown Gang Leader to Be Returned to U.S". New York Times: B1.
- "Reputed Gang Leader Gets Prison Term". New York Times: 43. 7 March 1993.
- James, George (22 November 1994). "33 Suspected Chinatown Gang Members Are Indicted: Racketeering charges are called major blow to the Flying Dragons". New York Times: B1.
- Mongelli, Lorena (14 July 2011). "Heated argument ends in murder-suicide in Queens". New York Post. Retrieved 11 August 2012.