FBI Muslim informants

"After years of emphasizing informant recruiting as a key task for its agents, the bureau now maintains a roster of 15,000 spies—many of them tasked, as Hussain was, with infiltrating Muslim communities in the United States. In addition, for every informant officially listed in the bureau's records, there are as many as three unofficial ones, according to one former high-level FBI official, known in bureau parlance as "hip pockets.""