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In the days of the Cold War, the free flow of information into the Warsaw Pact countries was blocked by a literal "iron curtain" of steel fences and mines. Now, the control of electrons -- not border crossings -- has become crucial to keeping your populace in the dark, a lesson the repressive regime of Iran, long fearful of the potential of the Internet, appears to have learned well. Still, all is not yet lost; as the Iranian regime's control over electronic media grows ever tighter, the United States is doing everything it can to ensure Iranians retain access to an open web.