This book is based on open source research into the scope of organized crime and terrorist activity in the Republic of Mexico during the period 1999 to 2002, and the extent of cooperation and possible overlap between criminal and terrorist activity in that country. The analyst examined those organized crime syndicates that direct their criminal activities at the United States, namely Mexican narcotics trafficking and human smuggling networks, as well as a range of smaller organizations that specialize in trans-border crime. The presence in Mexico of transnational criminal organizations, such as Russian and Asian organized crime, was also examined. In order to assess the extent of terrorist activity in Mexico, several of the country's domestic guerrilla groups, as well as foreign terrorist organizations believed to have a presence in Mexico, are described. The book extensively cites from Spanish-language print media sources that contain coverage of criminal and terrorist organizations and their activities in Mexico.