It was no surprise that the fugitive intelligence contractor Edward Snowden's original security clearance was flawed. But a new lawsuit by the Justice Department makes an astonishing claim: more than 660,000 background investigations by an outside firm were fraudulent. The Clinton Administration started out-sourcing security background checks in 1996. Since then, US Investigations Services, or USIS, has done 45% of the work. Now the Justice Department is accusing the company of massive fraud. Dion Nissenbaum covers national security for the Wall Street Journal.