Tracking wire/mail fraud (interstate financial fraud, for the most part) was actually their original purpose. When a presidential protection unit was first bein

Tracking wire/mail fraud (interstate financial fraud, for the most part) was actually their original purpose. When a presidential protection unit was first being put together, the FBI didn't exist yet, so the Secret Service was the only police agency under Federal control, and they got the protection detail as a kind of side job. These days, they're best known as bodyguards, but they still have their original mission to deal with.