The FBI is supposed to keep us safe, protect our rights, and defend the rule of law. Yet for more than a century, the FBI has aggressively targeted dissidents, gone after minorities, and overstepped its authority in ways that have defined American policing. Mike German, a former FBI agent, discusses his new book and how a post-9/11 FBI has exacerbated divisions in American society even as it has ignored the rise of white supremacist violence.