How Many Will End Up Disappeared?

Dozens of students scuffled with hardline supporters of Mahmoud Ahmadinejad at Tehran University campus and chanted "Death to the dictator" ahead of a speech there by the Iranian president.

"Revolutionary president, we support you," the hardline students shouted back, pushing and shoving those who were voicing opposition to Ahmadinejad.

Police in riot gear gathered outside the campus.

How many will end up disappeared? Vanish without a trace? Totalitarian regimes do not tolerate free expression since people might get the wrong ideas - like expressing ideas that run contrary to those of the ruling elites.