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 Agency. By then, strikebreaking work had declined. State and federal legislation outlawing the use of private detectives for the purpose of spying on or harassing workers, along with shifting public opinion, had made such detectives less useful to management in labor disputes. After the agency closed its doors, most of the company's files were destroyed or lost. The largest collection of extant files is housed at the Eastern Regional Coal Archives, in Bluefield, West Virginia. Baldwin–Felts Detective Agency The Baldwin–Felts Detective Agency was a private detective agency in the United States from the early 1890's to 1937. Today, it is