Forty years ago, Ayatollah Ruhollah Khomeini spearheaded an Islamic Revolution that deposed Iran's shah. The country's authoritarian monarchy was replaced by a repressive theocracy, and almost overnight, Iran was transformed from a crucial U.S. ally to bitter foe.
In Pictures: Iran's 1979 Islamic Revolution
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A shooting victim is carried away from the U.S. Embassy by armed men loyal to Ayatollah Khomeini after they had stormed the compound.
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A U.S.citizen carries belongings past an armed Khomeini loyalist who is guarding an evacuee staging area in Tehran on February 17, 1979. Hundreds of Americans began to flee Iran following the first attempt to seize the U.S. Embassy.
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Armed men loyal to Ayatollah Khomeini stand guard at Teheran's Mehrabad International Airport on February 18, 1979. Hundreds of U.S. citizens attempted to board an evacuation flight to leave Iran.
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Tens of thousands of Iranian women gather in Tehran on March 16, 1979, to support Ayatollah Khomeini's call for women to adhere to Islamic laws. This included the wearing of a long black garment, the chador.