The dispute over the handshake occurred during a particularly fierce round of the factional fighting that has hamstrung the country since the 1979 revolution. Far more harsh examples abound.

Young men wearing T-shirts deemed too tight or haircuts seen as too Western have been paraded bleeding through Tehran’s streets by uniformed police officers who force them to suck on plastic jerrycans, a toilet item Iranians use to wash their bottoms. In case anyone misses the point, it is the official news agency Fars distributing the pictures of what it calls “riffraff.” Far bloodier photographs are circulating on blogs and on the Internet.

The country’s police chief boasted that 150,000 people — a number far larger than usual — were detained in the annual spring sweep against any clothing considered not Islamic. More than 30 women’s rights advocates were arrested in one day in March, according to Human Rights Watch, five of whom have since been sentenced to prison terms of up to four years. They were charged with endangering national security for organizing an Internet campaign to collect more than a million signatures supporting the removal of all laws that discriminate against women.

Eight student leaders at Tehran’s Amir Kabir University, the site of one of the few public protests against Ahmadinejad, disappeared into Evin Prison starting in early May. Student newspapers had published articles suggesting that no humans were infallible, including the Prophet Muhammad and Iran’s supreme leader, Ayatollah Ali Khamenei.

The National Security Council sent a stern three-page warning to all the country’s newspaper editors detailing banned topics, including the rise in gasoline prices or other economic woes like possible new international sanctions, negotiations with the United States over the future of Iraq, civil society movements and the Iranian-American arrests.

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