From wikipedia:
Lastly, Title 28 USC Chapter 37 § 564. authorizes United States marshals, deputy marshals and such other officials of the Service as may be designated by the Director, in executing the laws of the United States within a State, to exercise the same powers which a sheriff of the State may exercise in executing the laws thereof.[11]
U.S. Marshals are also responsible for carrying out evictions within the District of Columbia.
Federal law that says federal agents are superior. I am sure in the third grade your teacher told you not to use the word in the definition. Same logic applies here: Circular reference. Federal law giving federal law superior powers? That’s as fiat as can be.