Kate Warne is known for being the first female detective, a Civil War spy, and a bodyguard for Abraham Lincoln, all while working for famed detective and spy Allan Pinkerton. Google her name and you will find many articles, often with the above image. In these articles, the person standing with their hand on the pole is identified as Kate Warne.
This misidentification started around the year 2000, when someone writing for a private detective history website decided the person standing behind Pinkerton looked female and, believing Warne was with Pinkerton at this time, decided it must be her.
This was backed up by an “analysis” of the person’s appearance that concluded they were a female. Since then, the image, with the Warne misidentification attached, has spread like wildfire.
But those seeking to identify the person in the photograph failed to do one thing: Check the identification on the original image. The sleeve that holds the original negative (owned by the Library of Congress) identifies the person behind Pinkerton as John C. Babcock. Other, easily found images of Babcock confirm that it is him.