Described by a CIA co-worker as a "genius among geniuses", Edward Snowdon managed to pull off the greatest intelligence heist in history. He absconded with literally millions of classified documents, and left the US and allies still unsure of exactly what secrets he took. In this first part of a two part examination we look at how Snowdon found himself at the heart of the intelligence beast, how he managed to walk out the door with a treasure trove of intel, and how that dumb terminal you're used to working on ain't so dumb.

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