FBI Drops Law Enforcement as 'Primary' Mission

Whatever the reason, the agency's increased focus on national security over the last decade has not occurred without consequence. Between 2001 and 2009, the FBI doubled the amount of agents dedicated to counterterrorism, according to a 2010 Inspector's General report. That period coincided with a steady decline in the overall number of criminal cases investigated nationally and a steep decline in the number of white-collar crime investigations.

"Violent crime, property crime and white-collar crime: All those things had reductions in the number of people available to investigate them," former FBI agent Brad Garrett told Foreign Policy. "Are there cases they missed? Probably."

Last month, Robert Holley, the special agent in charge in Chicago, said the agency's focus on terrorism and other crimes continued to affect the level of resources available to combat the violent crime plaguing the city. "If I put more resources on violent crime, I'd have to take away from other things," he told The Chicago Tribune.