7 of the Greatest Spies Who Ever Lived: List of Famous Spies of All Time

1. Alan Pinkerton

Started working as a spy in 1850.

A Scottish detective, known for pioneering a lot of spying techniques, which are used even today, was actually the first detective who overshadowed his “targets”, and his undercover operations, named “the interpretation of the role,” helped in forming of the modern espionage. Pinkerton was the founder of the Pinkerton National Detective Agency, in 1850, and his team was most remembered for monitoring and capturing several of important criminals from that period. During the American Civil War, Pinkerton was a close associate and adviser of Abraham Lincoln, and he was also in charge of the Intelligence Service of the Union. In 1861, he helped in the prevention of the murder conspiracy of Lincoln, by placing his spies inside the Confederate army, and even he was undercover as an officer of the Confederation, to gather information regarding the movements of enemy troops.

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