This report assesses the activities of organized crime groups, terrorist groups, and narcotics traffickers in general in the Tri-Border Area (TBA) of Argentina, Brazil, and Paraguay, focusing mainly on the period since 1999. Some of the related topics discussed, such as governmental and police corruption and anti-money-laundering laws, may also apply in part to the three TBA countries in general in addition to the TBA. This is unavoidable because the TBA cannot be discussed entirely as an isolated entity. Based entirely on open sources, this assessment has made extensive use of books, journal articles, and other reports available in the Library of Congress collections. It is based in part on the author's earlier research paper entitled "Narcotics-Funded Terrorist/Extremist Groups in Latin America" (May 2002). It has also made extensive use of sources available on the Internet, including Argentine, Brazilian, and Paraguayan newspaper articles. One of the most relevant Spanish-language sources used for this assessment was Mariano Cesar Bartolome's paper entitled Amenazas a la seguridad de los estados: La triple frontera como 'area gris' en el cono sur americano Threats to the Security of States: The Triborder as a 'Grey Area' in the Southern Cone of South America] (2001). The selective bibliography includes books, journal articles, and other reports. Newspaper and magazine articles are footnoted. This report also includes an appendix containing brief profiles of five alleged operatives of Islamic fundamentalist groups in the TBA and a diagram of drug-trafficking routes in the region. The information cutoff date used in this report is July 2003. Thus, it lacks any updated information about the individuals discussed in it. However, the study has been partially edited as of November 2010 to reflect the fact that Rajkumar Sabnani or Rajkumar Naraindas Sabnani, whose alleged fund-raising or money laundering on behalf of TBA extremists was reported in the original edition, has been completely exonerated of any involvement. Sabnani is a prominent and respected businessman residing in Hong Kong. Moreover, criminal proceedings against Sabnani's relatives and employees in Paraguay were officially closed, and all parties were acquitted and absolved of any guilt or punishment in July 2007. Therefore, the information about Sabnani and his associates has been removed from this version of the study."