WATCHLISTS

Watchlists originated from various government lists tracking individuals for different threats (like financial crime or terrorism) but became centralized and massive after 9/11, driven by the need for better coordination, leading to the U.S. government's single Terrorist Screening Database (TSDB) to consolidate names and flag potential terrorists for enhanced security, especially for travel and border protection. The system grew significantly, incorporating diverse data sources and expanding from dozens to millions of names, though it's faced criticism for its secrecy, potential for error, and impact on civil liberties.

Before 9/11, various U.S. agencies maintained separate watchlists for different concerns, including financial crimes (sanctions lists by OFAC) and suspected terrorists, but these lacked integration. The attacks highlighted a failure to share critical intelligence and track potential threats across agencies. In response, Homeland Security Presidential Directive 6 (HSPD-6) directed the consolidation of these scattered lists into one central database, the Terrorist Screening Database (TSDB).

The FBI's Terrorist Screening Center (TSC) was established to manage the TSDB, creating a unified point for sharing data with federal, state, and local agencies. Information comes from various sources, including tips from citizens, law enforcement, and intelligence agencies, using criteria like "reasonable suspicion".The list grew exponentially from around 120,000 names initially to millions, incorporating data from the Terrorist Identities Datamart Environment (TIDE) list.

The list is used for screening at airports (like flagging passengers for enhanced screening), border crossings, and even for employment or financial transactions. A subset of the TSDB, the No-Fly List specifically prevents individuals from boarding commercial flights. The system operates largely in secret with vague standards, leading to concerns about due process and errors. Tens of thousands of innocent people, including U.S. citizens, have been wrongly placed on lists, facing harassment, travel bans, and other severe consequences.