United States Federal Witness Protection Program

The United States Federal Witness Protection Program (WPP), also known as the Witness Security Program or WITSEC, is a witness protection program codified through 18 U.S. Code § 3521 and administered by the United States Department of Justice. The program is operated by the United States Marshals Service and is designed to protect threatened witnesses and their family members before, during, and after a trial when those witnesses have an association with the federal government.

Source: Wikipedia — United States Federal Witness Protection Program (CC BY-SA 4.0)