"The Terrorist Identities Datamart Environment (TIDE) is the U.S. Government's (USG) central repository of information on international terrorist identities. The Intelligence Reform and Terrorism Prevention Act (IRTPA) of 2004 established NCTC [National Counterterrorism Center] in law, and mandated the Center serve as the 'central and shared knowledge bank on known and suspected terrorists and international terror groups.' TIDE is that knowledge bank and supports the USG's various terrorist screening systems or 'watchlists' and the US Intelligence Community's overall counterterrorism mission. The TIDE database includes, to the extent permitted by law, all information the USG possesses related to the identities of individuals known or appropriately suspected to be or to have been involved in activities constituting, in preparation for, in aid of, or related to terrorism (with the exception of purely domestic terrorism information). This information is available to counterterrorism professionals throughout the Intelligence Community, including the Department of Defense, via the web-based, read-only 'TIDE Online.'"
National Counterterrorism Center: http://www.nctc.gov/