What is the primary function of the U.S. Marshals Service?

The primary function of the U.S. Marshals Service is to provide security for the federal judiciary, which includes the management of federal courts and the protection of witnesses. This agency plays a crucial role in ensuring the safe functioning of the justice system by transporting federal prisoners, executing federal court orders, and apprehending fugitives.

Witness protection is a key component of this mission, as the U.S. Marshals Service administers the Witness Security Program, designed to protect witnesses who testify in federal cases from threats and harm. This unique aspect of their role emphasizes their importance in maintaining the integrity and safety of the judicial process.

The other options relate to different functions that are not the primary responsibilities of the U.S. Marshals. Local law enforcement typically falls under state and municipal jurisdictions, federal prisons management is handled by the Federal Bureau of Prisons, and Coast Guard operations involve maritime law enforcement, search and rescue, and environmental protection, which are separate from the duties of the Marshals Service.