The crimes that require international cooperation are drug trafficking, the smuggling of luxury goods and firearms, the theft and smuggling of luxury vehicles, credit card fraud, illegal immigration and alien smuggling, prostitution, pickpocket gangs, shoplifting, and burglary. Gangs in Hong Kong and their relationship to organized crime are also discussed. The overview of the principles of the Hong Kong criminal justice system addresses Hong Kong laws and the process of enactment, the judiciary, and the custody and treatment of offenders. The author concludes that the development of cooperation and understanding through liaison has been the single most effective tool in the fight against the transnational expansion of the criminal activities of internationally active criminal groups. Hong Kong has sought to stay in the forefront of this process through a commitment to liaison, the development of indepth intelligence assessments of these criminal activities, and by the use of innovative computer technology. It has become apparent during this process that most organized crime groups thrive on their ability to identify and exploit loopholes in the various enforcement responses and styles in various jurisdictions across the world. The most effective way to neutralize this threat has been improved cooperation between law enforcement agencies and a better understanding of respective justice administration systems.