From the Palmer Raids to the McCarthy era, to ABSCAM and Waco, the FBI has been enmeshed in controversy since its creation. It is also deeply woven into the fabric of our national identity and popular culture. The subject of countless movies, books, and television shows, we are fascinated by its mystique and drama. But how did the bureau that began with a modest 34 investigators in 1908 become the powerful force that it is today, employing over 12,000 agents across the country?