n.
1.the United States' oldest federal law enforcement agency is responsible today for protecting the Federal Judiciary and transporting federal prisoners and protecting federal witnesses and managing assets seized from criminals and generally ensuring the effective operation of the federal judicial system
Idiom of the Day
pass oneself off as (someone or something) else
to claim to be someone one is not, to pretend to be someone else
My friend passed himself off as a reporter and was able to get into the concert free.