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Central Intelligence Agency
Cia: Intelligence in the Civil War [Pdf]
A multi-topic look at intelligence gathering, the tools used, and the people involved in both the North and the South during the Civil War. Comprehensive, interesting coverage from the CIA.
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...
Other
Signal Corps Association: Espionage in the Civil War
Read about the murky underground stories of espionage on both sides of the Civil War. The spies were often eccentric, and the raiders ruthless.