The United States Secret Service (USSS) is an American federal law enforcement agency under the U.S. Department of Homeland Security. Until 2003, the Service was part of the U.S. Department of the Treasury.
The U.S. Secret Service has two distinct areas of responsibility:
The Secret Service’s initial responsibility was to investigate counterfeiting of U.S. currency, which was rampant following the U.S. Civil War. The agency then evolved into the United States’ first domestic intelligence and counterintelligence agency. Many of the agency’s missions were later taken over by subsequent agencies such as the Federal Bureau of Investigation (FBI), Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), and IRS Criminal Investigation Division (IRS).
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