The United States Marshals Service (USMS) is a federal law enforcement agency within the U.S. Department of Justice (see 28 U.S.C. § 561). It is the oldest American federal law enforcement agency, which was created by the Judiciary Act of 1789. The Marshals Service is attached to the Judicial branch of government, and is the enforcement arm of the federal courts. It is the primary agency for fugitive operations, responsible for prisoner transport, the protection of officers of the court, and for the effective operation of the judiciary. The Marshals Service operates the Witness Protection Program, and serves federal level arrest warrants.