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NEW YORK -- His first impulse was to dismiss the ominous email as a prank, says a young Iranian-American named Koosha. It warned the 29-year-old engineering student that his relatives in Tehran would be harmed if he didn't stop criticizing Iran on Facebook.

Two days later, his mom called. Security agents had arrested his father in his home in Tehran and threatened him by saying his son could no longer safely return to Iran.

"When they arrested my father, I realized the email was no joke," said Koosha, who asked that his full name not be used.

Tehran's leadership faces its biggest crisis since it first came to power in 1979, as Iranians at home and abroad attack its legitimacy in the wake of June's allegedly rigged presidential vote. An opposition effort, the "Green Movement," is gaining a global following of regular Iranians who say they never previously considered themselves activists.