Iranian crackdown goes global....

Critics of the regime are being harassed world-wide...

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.

The regime has been cracking down hard at home. And now, a Wall Street Journal investigation shows, it is extending that crackdown to Iranians abroad as well.

In recent months, Iran has been conducting a campaign of harassing and intimidating members of its diaspora world-wide -- not just prominent dissidents -- who criticize the regime, according to former Iranian lawmakers and former members of Iran's elite security force, the Revolutionary Guard, with knowledge of the program.

Part of the effort involves tracking the Facebook, Twitter and YouTube activity of Iranians around the world, and identifying them at opposition protests abroad, these people say.

Interviews with roughly 90 ordinary Iranians abroad -- college students, housewives, doctors, lawyers, businesspeople -- in New York, London, Dubai, Sweden, Los Angeles and other places indicate that people who criticize Iran's regime online or in public demonstrations are facing threats intended to silence them.

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