Federal Bureau of Investigation(FBI)
Drug Enforcement Administration or Agency(DEA)
Alcohol Tobacco Firearms(ATF)
FBI, CIA, NSA, ICE, Customs.
The oldest federal agency in the U.S.A is the U.S. Marshals Office Provided by Jamason Wells W.T.I. Florida
Among many: The Federal Burequ of Investigation (FBI) - The U.S. Marshalls Serivce - Bureau of Alcohol, TObacco, and Irearms (ATF).
If you take into consideration the fact that the US Coast Guard is charged with enforcing the nations laws, then it would be THAT agency which began its life as the US Revenue Cutter Service.
The three levels of Law Enforcement are - Federal Bureau of Investigation (FBI), State and Local
The Government's War on Cameras
What Shapes Purpose in Public Defense Law Career
States Considering a “Caylee’S Law” For Missing Children
How Public Defense Law Job Shapes Character and Skills