The United States Secret Service was established in the Department of the Treasury in 1865 as the Secret Service Division. It is responsible for investigating currency counterfeiting and other types of financial fraud, and the Service provides protection to the President, his family, former presidents, presidential candidates, and visiting heads of state. In 2003, it was transferred to DHS.
Government Documents holds a small collection of Secret Service publications, mostly documents about the agency's history and notices about U.S. currency. We also have many Congressional hearings about the agency's activities and budget. Search for these in ProQuest Congressional.