Library of Congress
Loc: America's Story: Detective Allan Pinkerton
Allan Pinkerton saved Abraham Lincoln from an assassination attempt, started the United States Secret Service and helped slaves seek freedom via the Underground Railroad. Learn about his early life in Scotland and view a photograph of...
A&E Television
History.com: How Mc Kinley's Assassination Spurred Secret Service Presidential Protection
The Secret Service accompanies the president and the First Family everywhere, but it wasn't always this way. It would take a third assassination of a U.S. president -- William McKinley -- to prompt Congress to assign full official...