An NPR piece on the NYPD’s intelligence gathering can be found here
“Morning Edition, May 3, 2005 · Some cities are creating their own intelligence units to get the law enforcement information they want when they want it. Such independent activity isn’t necessarily well received by the FBI and other federal agencies. A look at New York City’s Intelligence Division, which was started after Sept. 11 and is housed in a secret location in the city.”
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