From the linked article..

It flew in the face of a June 2006 promise by J. Stephen Tidwell, an assistant director with the FBI, in a speech before an angry crowd at the Islamic Center of Irvine, that the bureau would never spy on mosques. That promise followed an Orange County Register story that quoted an FBI agent telling a group of Republicans in Newport Beach that the bureau was monitoring “extremists” affiliated with UC Irvine’s Muslim Student Union. (See Derek Olson’s “Against the Wall,” Oct. 19, 2007.)

I remember that story way back when it first came out. Here at LGF.