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Sleeper cells are often talked about with fear, as if they exist only as hidden threats planted by hostile nations. The idea is simple: individuals quietly living normal lives, waiting years for a signal to act. It sounds unsettling because it reminds people that not every danger announces itself. …

Sleeper cells are often talked about with fear, as if they exist only as hidden threats planted by hostile nations. The idea is simple: individuals quietly living normal lives, waiting years for a signal to act. It sounds unsettling because it reminds people that not every danger announces itself. But the truth is more balanced than that. The United States has long understood the concept of hidden threats and quiet infiltration. Because of that, America has invested heavily in intelligence, co