The presence of Pinkerton detectives in the city also merited some investigation.

The use of Pinkerton detectives in strikes and yellow-dog contracts were outlawed.

Frank hired two Pinkerton detectives to help him prove his innocence.

"The last time I saw you, you were a Pinkerton detective."

Or perhaps one should call them the Internet's Pinkerton detectives.

Pinkerton detectives had learned of the plan and ten agents were waiting aboard the train.

One was from the Pinkerton detective who had found her mother.

Upon their landing, a large mêlée between workers and Pinkerton detectives ensued.

Meanwhile, young women have been disappearing - murdered, presumably - and a Pinkerton detective has appeared on the scene to investigate.

The Pinkerton detectives turned over what they had gathered and gave it to me.