What private policing agency thwarted the alleged "Baltimore Plot" to assassinate president-elect Abraham Lincoln shortly before the Civil War?

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The Pinkerton Agency was responsible for thwarting the alleged "Baltimore Plot" to assassinate president-elect Abraham Lincoln shortly before the Civil War. The agency was founded by Allan Pinkerton in 1850 and quickly became known for its private investigative and security services. In this case, Pinkerton detectives were able to infiltrate the group planning to assassinate Lincoln and ultimately prevented the plot from being carried out.

What Private Policing Agency Thwarted the Alleged "Baltimore Plot" to Assassinate