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President Theodore Roosevelt had created the bureau in 1908, hoping to fill the void in federal law enforcement. (Because of lingering opposition to a national police force, Roosevelt’s attorney general had acted without legislative approval, leading one congressman to label the new organization a “bureaucratic bastard.”) When White entered the bureau, it still had only a few hundred agents and only a smattering of field offices. Its jurisdiction over crimes was limited, and agents handled a hodgepodge of cases: they investigated antitrust and banking violations; the interstate shipment of stolen cars, contraceptives, prizefighting films, and smutty books; escapes by federal prisoners; and crimes committed on Indian reservations.
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David Grann (Killers of the Flower Moon: The Osage Murders and the Birth of the FBI)