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Yet from the outset the fascination with private detectives was mixed with aversion. They were untrained and unregulated and often had criminal records themselves. Beholden to paying clients, they were widely seen as surreptitious figures who burglarized people’s secrets. (The term “to detect” derived from the Latin verb “to unroof,” and because the devil, according to legend, allowed his henchmen to peer voyeuristically into houses by removing their roofs, detectives were known as “the devil’s disciples.”) In 1850, Allan Pinkerton founded the first American private detective agency; in advertisements, the company’s motto, “We Never Sleep,” was inscribed under a large, unblinking, Masonic-like eye, which gave rise to the term “private eye.” In a manual of general principles and rules that served as a blueprint for the industry, Pinkerton admitted that the detective must at times “depart from the strict line of truth” and “resort to deception.” Yet even many people who despised the profession deemed it a necessary evil. As one private eye put it, he might be a “miserable snake,” but he was also “the silent, secret, and effective Avenger of the outraged Majesty of the Law when everything else fails.
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David Grann (Killers of the Flower Moon: The Osage Murders and the Birth of the FBI)