Two evil isms

Charles A. Siringo

"The eye that never sleeps"

Frank Morn

The Pinks

Chris Enss

Labor espionage

Carl Elmer Nelson

Pinkerton's National Detective Agency

Pinkerton's National Detective Agency

The Pinkertons

Richard Wilmer Rowan

Inventing the Pinkertons, or, Spies, sleuths, mercenaries, and thugs

S. Paul O'Hara

Pinkerton's great detective

Beau Riffenburgh

The Pinkertons

James David Horan

The detective's assistant

Kate Hannigan

A cowboy detective

Charles A. Siringo

The Molly Maguires and the detectives

Allan Pinkerton

"The eye that never sleeps"

Frank Morn

Pinkerton's National Detective Agency and its connection with labor troubles at Homestead, Penn., July 6th, 1892

Pinkerton's National Detective Agency.

Pinkerton's National Detective Agency records

Pinkerton's National Detective Agency

Pinkerton's National Detective Agency

Pinkerton's National Detective Agency

Sacco-Vanzetti case

Pinkerton's National Detective Agency.

Warning!

Pinkerton's National Detective Agency

Pinkerton's National Detective Agency. Allan Pinkerton, Principal. ... To the legal profession

Allan Pinkerton

Tests on passenger conductors made by the National Detective Agency

Allan Pinkerton

Abduction of Charlie Brewster Ross

Allan Pinkerton

Two evil isms, Pinkertonism and anarchism, by a cowboy detective who knows, as he spent twenty-two years in the inner cirlce of Pinkerton's National Detective Agency

Charles A. Siringo

Investigation of Pinkerton Agency

United States. Congress. House. Committee on the Judiciary

Employment of Pinkerton detectives

United States. Congress. House. Committee on the Judiciary