"Transnational criminal activity has increased in scale and extent, becoming a complex worldwide threat. Transnational criminals ignore borders, they move sums of money through the international financial system that are so huge they dwarf the combined economies of many nations. They are often organized in multi-crime businesses, and they have capitalized on growth in international communications and transportation to expand their criminal operations and form potent alliances. The corrosive activities of transnational criminal groups in the post-Cold War era no longer threaten particular countries or regions. They threaten all nations. Transnational organized crime is not only a law enforcement problem, it is a formidable and increasing threat to national and international security. Transnational organized crime is not something completely new, but there is no standard, universally accepted definition of these kind of criminality in the criminological and criminal law theories. The problem of definition is an important factor contributing to the inability of international law enforcement bodies to identify the size and scope of transnational organized crime accurately. Efforts to form a definition were made many times, but they only made this problem more difficult or created new problems. Some definitions of this kind came to light during the international simposium on organized crime in Sant Claud (France), 1988, which is where the headquarters of Interpol was situated. Just before this event, 84 participants from 46 member-countries of Interpol agreed to accept the working formula (transnational organized crime) as a basis for further discussion."
United States Department of Justice, National Criminal Justice Reference Service: http://www.ncjrs.gov/