The Pinkerton Detective Agency is famous for being one of America’s first private detective agencies, for its Civil War-era intelligence work, and for its later role in tracking criminals and protecting railroads and businesses. It’s also widely remembered for controversial labor-related actions, including strikebreaking and clashes with workers.

Why it became well known

  • Allan Pinkerton founded it in 1850, and it grew into a major private law-enforcement force.
  • It gained national fame through stories tied to Abraham Lincoln and Civil War intelligence work.
  • It later became associated with investigations, security, and undercover operations.

Public image

  • In popular culture, Pinkertons are often linked to the Wild West, train robberies, and old-school detective work.
  • They’re also remembered as one of the earliest big private security firms in the United States.

TL;DR: Pinkerton is famous for pioneering private detective work, helping with Civil War intelligence, and later becoming notorious for labor conflict and strikebreaking.