How did Allan Pinkerton's organization provide security services in the United States?

Founded in 1850 by Allan Pinkerton, the Pinkerton National Detective Agency operated as a prominent private police force in the United States. Its services were developed during a period when municipal policing was often hampered by jurisdictional limitations, corruption, and political interference.12

The organization provided security and protection through several key methods:

• Specialized Investigations: The agency originally focused on railway security, protecting trains from theft and apprehending robbers. It gained fame for solving major cases, such as the 1866 Adams Express Company theft.13
• Private Security Contracting: In response to crime waves, many businesses contracted with the agency for private protection, as state laws allowed corporations to hire their own security forces.2
• Intelligence and Protection: The agency provided high-level security, most notably thwarting an assassination plot against Abraham Lincoln in 1861. During the Civil War, it also gathered military intelligence for the Union.13
• Labor Conflict Intervention: The agency became notorious for its role in strikebreaking and antilabor activities, including its involvement in the Homestead Strike and the infiltration of the Molly Maguires.123