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).