The revolution in Iran stands out as a striking exception to other Middle Eastern coups of the twentieth century. While the latter have mostly been of a military-putsch type, in Iran, an apparently stable regime was toppled by a civilian, predominantly clerical, leadership capable of calling forth mass participation on a vast scale, neutralizing the army, and forcing the shah into exile. This religious leadership was strong and resourceful enough to weld its components together and to overcome ideological barriers that elsewhere, and in other circumstances, would have precluded joint action. But in Iran—where political cooperation among divergent groups has been a recurrent feature for the past hundred years—the clergy, the National Front, other middle-of-the-road liberals, and the left were able to make common cause. Reviewing the period from 1890 to the mid-1960s, Nikki Keddie writes: “Although it is a truism that politics makes strange bedfellows…the alliance between much of the religious leadership of Iran and the most advanced Westernized political activists is virtually without parallel either in the Islamic or the non-Islamic world.”