The US Marshal Service is basically the judiciary's law enforcement branch. Yes, the DEA is also part of the DoJ, but the DEA is a lot more akin to the FBI than the Marshal Service.
Marshals do prisoner security and transport, run the witness protection program, and are the legal enforcers of the court's orders. For instance, when the Supreme Court ordered the integration of Southern schools, it was US Marshals who actually enforced the order and were deployed to escort students into their schoools.
Marshals do prisoner security and transport, run the witness protection program, and are the legal enforcers of the court's orders. For instance, when the Supreme Court ordered the integration of Southern schools, it was US Marshals who actually enforced the order and were deployed to escort students into their schoools.