Not like this hasn't been going on since before Ahmadin-jihad's time, but the Seattle & Los Angeles Times try to analyze why it's sped up (or the media has given it more attention) in recent months.
Why the regime has cracked down now remains unclear, although analysts offered several overlapping theories.
The widespread purges and arrests are expected to have an impact on parliamentary elections next year and the presidential contest in 2009, either discouraging or preventing reformers from running against the hard-liners who dominate all branches of government, Iranian and U.S. analysts say. The elections are one of several motives behind the crackdowns, they add.
Public signs of discontent — such as students booing Ahmadinejad on a campus in December, teacher protests in March over low wages and workers demonstrating on May Day — are also behind the detentions, according to Iranian sources....
The current crackdown is a way to instill fear in the population in order to discourage them from future political agitation as the economic situation begins to deteriorate," said Karim Sadjadpour, of the Carnegie Endowment for International Peace.
"You're going to think twice about taking to the streets to protest the hike in gasoline prices if you know the regime's paramilitary forces have been on a head-cracking spree the last few weeks."
Despite promises to use Iran's oil revenue to aid the poor, Ahmadinejad's economic policies have backfired, triggering 20 percent inflation over the past year, increased poverty and a 25 percent rise in the price of gas last month. More than 50 of the country's leading economists wrote an open letter to Ahmadinejad warning he is endangering the country's future.
Others see the repression as an attempt to establish firm control over the domestic situation as the country girds for possible war, international isolation or economic sanctions.