Most people who rely on print and TV news probably have never heard of fusion centers. There are as many as 72 of these facilities. 50 state-based and 22 urban centers were set up during the Bush presidency in cooperation between the DHS and the Department of Justice (DOJ).
Fusion centers contain large data warehouses that collect information from all 16 US intelligence agencies, including the CIA, FBI, NSA, the military, state and local police agencies, as well as privately owned corporations and organizations. That information includes the cell phone data and emails of every American citizen. There is one of these facilities in Madison near the Dane county regional airport, at 2445 Darwin Road.