The agency then evolved into the United States' first domestic intelligence and counterintelligence agency. currency, which was rampant following the American Civil War. The Secret Service's initial responsibility was to investigate the counterfeiting of U.S.

Also, the Secret Service investigates missing and exploited children and is a partner of the National Center for Missing & Exploited Children (NCMEC). The Secret Service is also a member of the FBI's Joint Terrorism Task Force (JTTF) which investigates and combats terrorism on a national and international scale. Cyber investigations include cybercrime, network intrusions, identity theft, access device fraud, credit card fraud, and intellectual property crimes. currency, bank and financial institution fraud, mail fraud, wire fraud, illicit financing operations, and major conspiracies. Financial investigations include counterfeit U.S. The Secret Service is tasked with safeguarding the payment and financial systems of the United States from a wide range of financial and cyber-based crimes. As part of the service's mission of preventing an incident before it occurs, the agency relies on meticulous advance work and threat assessments developed by its Intelligence Division to identify potential risks to protectees. The Secret Service is the lead agency in charge of the planning, coordination, and implementation of security operations for events designated as National Special Security Events (NSSE). The protective mission includes protective operations to coordinate manpower and logistics with state and local law enforcement in the US, protective advances to conduct site and venue assessments for protectees, and protective intelligence to investigate all manners of threats made against protectees. The Secret Service also provides physical security for the White House Complex the neighboring Treasury Department building the vice president's residence the principal private residences of the president, vice president and former presidents and all foreign diplomatic missions in Washington, D.C. By federal statute, the president and vice president may not refuse this protection. By custom, it also provides protection to the Secretary of the Treasury and Secretary of Homeland Security, as well as other persons as directed by the president (usually the White House Chief of Staff and National Security Advisor, among others). The Secret Service is tasked with ensuring the safety of the President of the United States, the Vice President of the United States, the President-elect of the United States, the Vice President-elect of the United States, and their immediate families former presidents, their spouses and their minor children under the age of 16 Those in the presidential line of succession, major presidential and vice-presidential candidates and their spouses and visiting foreign heads of state and heads of government. The Secret Service is mandated by Congress with two distinct and critical national security missions: protecting the nation's leaders and safeguarding the financial and critical infrastructure of the United States. In 1901, the Secret Service was also assigned to presidential protection duties.

President Abraham Lincoln signed the legislation on April 14, 1865, just a few hours before he was assassinated.

Until 2003, the Secret Service was part of the Department of the Treasury, as the agency was founded in 1865 to combat the then-widespread counterfeiting of U.S. political leaders, their families, and visiting heads of state or government. The United States Secret Service ( USSS or Secret Service) is a federal law enforcement agency under the Department of Homeland Security charged with conducting criminal investigations and protecting U.S. Department of Homeland Security (2003–present)

Secret government website