The enforcers of the regime are the basij, who operate as "morality police" and deal with people who speak out against the regime. They are recruited and locally controlled by the clerics of the local mosques. Their role is to enforce Islamic orthodoxy. Most are recruited from the rural poor. They serve as the regime's way to keep the educated middle class on a leash. Visualize if Obama had recruited the underclass here, and made them official "Guardians of Homeland Security", with the legal power to arrest and beat up anti-government elements.
It looks like their currency is on a long slide. When the regime loses the ability to pay the basiji with money that actually buys anything, the regime loses its ability to stay in control of Iran.
I think he tried that... the "civilian defense force," see keywords fedeyeenobama & obamafedeyeen
""We cannot continue to rely on our military in order to achieve the national security objectives we've set. We've got to have a civilian national security force that's just as powerful, just as strong, just as well-funded." ~ Barack Obama, July 2nd, 2008
also
"The Return of the Draft," Politics | Fri, Nov 7, 2008 at 10:12:30 am PSTPolitics | Little Green Footballs blog,
:[later discretely dropped] http://littlegreenfootballs.com/article/31851_Obama_Quietly_Revokes_His_Plan_for_a_Draft