The Hostage Rescue Team (HRT) is the Federal Bureau of Investigation's (FBI) elite tactical unit. The HRT was formed to provide a full-time federal law enforcement tactical capability to respond to major terrorist incidents throughout the United States. Today, the HRT performs a number of tactical law enforcement and national security functions in high-risk environments and conditions and has deployed overseas, including with military Joint Special Operations Command units.

The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. An agency of the United States Department of Justice, the FBI is also a member of the U.S. Intelligence Community and reports to both the Attorney General and the Director of National Intelligence. A leading U.S. counterterrorism, counterintelligence, and criminal investigative organization, the FBI has jurisdiction over violations of more than 200 categories of federal crimes.