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A consummate G-man, J. Edgar Hoover led the FBI for close to 40 years, becoming one of the most influential figures of the 20th century. Demanding rigor, loyalty and stealth from his subordinates, he worked closely with presidents of both parties, but his own views were steeped in conservative ideas on religion, race and anticommunism. Historian Beverly Gage considers Hoover’s legacy and helps us ask: Can the bureau he built effectively investigate a former president — and protect the republic?