Ever since George Washington used them to help topple the British, spies and their networks have helped and hurt America at key moments in history. In this fascinating collection, Paul B. Janeczko probes examples from clothesline codes to surveillance satellites and cyber espionage. Colorful personalities, daring missions, the feats of the loyal, and the damage of traitors are interspersed with a look at the technological advances that continue to change the rules of gathering intelligence. Back matter includes source notes, a bibliography, and an index.