It is the singer not the song: know your players

• At least four distinct security institutions are involved in suppressing the demonstrations that have erupted since the June 12th election: The Pasdaran, the Army, the police and the Basij.
• The Pasdaran or Iranian Revolutionary Guard Corp have the primary mission of protecting the Islamic Revolution. The Pasdaran number more than 100,000, or roughly one-sixth the size of the standing Army. I have not seen any indication in recent days of any hesitancy among thePasdaran leadership in putting down the disturbances, but I have read some unconfirmed reports of a division between Pasdaran officers and troops.
• The Army may be another matter. Soldiers share an heroic self-image as defenders of the nation and they certainly do not like suppressing civilians, especially unarmed, relatively respectful ones. Moreover, responding to civil unrest is hardwork. Soldiers hate doing it in my experience....
• Police have the task of keeping civil order, but once the numbers of demonstrators grew into the thousands and the demonstration sites increased, they lacked the numbers needed to maintain order. At present, the role of the police seems to be relatively unimportant.
• In the Iranian case, the Basijis are the heavies who use thuggery to intimidate demonstrators. The higher the profile of the Basijis in suppressing demonstrators, the higher the reputational costs for the regime of suppression. When mobilized, the Basij are supposed to be subordinate to the Pasdaran, but I cannot tell if this is actually the case at present. (Saturday, June 20, 2009, "Does the state have the upper hand?," Informed Comment blog)