 The Pinkerton Labor Spy

The Pinkerton Labor Spy (alternately, The Pinkerton's Labor Spy) is a nonfiction book published in 1907 as an exposé of intrigue and abuses by the Pinkerton Detective Agency in general, and by chief agent James McParland in particular.The book detailed the use of spies by mining and ore milling companies during the period of the Colorado Labor Wars.