The contest between liberty and security has been with America since its founding. It has been fought on the public stage by every President from George Washington to Barack Obama. Each generation, from those facing rebellion in the 1860s to those pushing back against government intrusions a century later, has debated where to strike a balance. But in the dark world of 21st century law enforcement, where terrorist threats can hide behind our most cherished freedoms, the battle sometimes takes place in government documents so obscure that they escape public notice.
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