Department of Justice - US Marshals Service

The United States Marshals Service is a United States federal law enforcement agency within the United States Department of Justice and is the oldest federal law enforcement agency in the United States. The United States Marshals Service is the enforcement arm of the United States federal courts. U.S. Marshals protect court officers and buildings and ensure the effective operation of the judicial system. The US Marshals Service assists with court security and prisoner transport, serves arrest warrants and seeks fugitives.