The United States Secret Service is mandated by statute and executive order to carry out two significant missions: protection and criminal investigations. The Secret Service protects the President and Vice President, their families, heads of state, and other designated individuals; investigates threats against these protectees; protects the White House, Vice President’s Residence, Foreign Missions, and other buildings within Washington, D.C.; and plans and implements security designs for designated National Special Security Events. The Secret Service also investigates violations of laws relating to counterfeiting of obligations and securities of the United States; financial crimes that include, but are not limited to, access device fraud, financial institution fraud, identity theft, computer fraud; and computer-based attacks on our nation’s financial, banking, and telecommunications infrastructure. The Secret Service Investigative Mission: The Secret Service was established as a law enforcement agency in 1865. While most people associate the Secret Service with Presidential protection, our original mandate was to investigate the counterfeiting of U.S. currency--which we still do. Today our primary investigative mission is to safeguard the payment and financial systems of the United States. This has been historically accomplished through the enforcement of the counterfeiting statutes to preserve the integrity of United States currency, coin and financial obligations. Since 1984, our investigative responsibilities have expanded to include crimes that involve financial institution fraud, computer and telecommunications fraud, false identification documents, access device fraud, advance fee fraud, electronic funds transfers, and money laundering as it relates to our core violations. The Secret Service believes that its primary enforcement jurisdictions will only increase in significance in the 21st Century. For this reason, the Secret Service has adopted a proactive approach to monitor the development of technology and continue to use it in the interest of federal, state, and local law enforcement. http://www.secretservice.gov FBI's Top Priorities (2003) 1. Protect the United States from terrorist attack. 2. Protect the United States against foreign intelligence operations and espionage. 3. Protect the United States against cyber-based attacks and high-technology crimes. 4. Combat public corruption at all levels. 5. Protect civil rights. 6. Combat transnational and national criminal organizations and enterprises. 7. Combat major white-collar crime. 8. Combat significant violent crime. 9. Support federal, state, county, municipal, and international partners. 10. Upgrade technology to successfully perform the FBI’s mission. The Federal Bureau of Investigation (FBI) is the investigative arm of the US Department of Justice. The FBI’s investigative authority can be found in Title 28, Section 533 of the US Code. Additionally, there are other statutes, such as the Congressional Assassination, Kidnapping, and Assault Act (Title 18, US Code, Section 351), which give the FBI responsibility to investigate specific crimes. http://www.fbi.gov Hopefully, this will give you an idea of how the two organizations differ in their functions/missions. I listed their websites if you would like more information. I hope this is helpful.