Inside the spy unit that NYPD says doesn't exist, by Adam Goldman. Associated Press, 31 August 2011.
NEW YORK (AP) — From an office on the Brooklyn waterfront in the months after the Sept. 11, 2001, terrorist attacks, New York Police Department officials and a veteran CIA officer built an intelligence-gathering program with an ambitious goal: to map the region's ethnic communities and dispatch teams of undercover officers to keep tabs on where Muslims shopped, ate and prayed.

The program was known as the Demographics Unit and, though the NYPD denies its existence, the squad maintained a long list of "ancestries of interest" and received daily reports on life in Muslim neighborhoods, according to documents obtained by The Associated Press.