You must research Espionage (an optional tech after the optional tech Nationalism). You must then build the small wonder "Intelligence Agency" in one of your cities. With the Intelligenece Agency built, you can plant spies with other known civilizations -- there are a number of ways to do this: (1) click the "E" which appears along the right-hand border of the Info Box (in the lower right of your map view); (2) double-click on the pentagon-shaped symbol that appears next to the city name of the city that built the IA (looking at the city on the map); (3) double-click on an enemy capitol; or (4) hit Ctrl-Shft-E.
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