<P> The United States Secret Service ( also USSS or Secret Service ) is a federal law enforcement agency under the United States Department of Homeland Security , charged with conducting criminal investigations and protecting the nation 's leaders . Until 2003 , the Service was part of the U.S. Department of the Treasury , as the agency was originally founded to combat the then - widespread counterfeiting of U.S. currency . </P>
what is the function of the secret service
conducting criminal investigations protecting the nation 's leaders