Allan Pinkerton affiliated with the notorious Banditti of the Prairie. After observing their movements for some time he informed the local sheriff, who arrested them. This later led to Pinkerton being appointed, in 1849, as the first police detective in Chicago, Cook County, Illinois. In 1850, he partnered with Chicago attorney Edward Rucker in forming the North-Western Police Agency, which later became Pinkerton & Co, and finally Pinkerton National Detective Agency, still in existence today as Pinkerton Consulting and Investigations, a subsidiary of Securitas AB. Pinkerton's business insignia was a wide open eye with the caption "We never sleep." As the US
Baldwin–Felts Detective Agency the early 1890s by William Gibbony Baldwin as the Baldwin Detective Agency. Baldwin, the senior member of the firm, was a native of Tazewell County, Virginia. An avid reader of detective novels in his youth, Baldwin was a small storekeeper in his early days. He then studied dentistry but left that profession to become a detective. He began his career in 1884 with the Eureka Detective Agency in Charleston, West Virginia. After founding the Baldwin Detective Agency, he then moved to Roanoke, Virginia, to oversee security operations in the Norfolk & Western Railway's coalfield district, later being appointed chief special