This illustrates both a problem with trying to retroactively jam events into ideological frameworks, and a tragedy of revolutionary parties. At the time, the Shah's government was percieved as authoritarian - that's why there was a revolution in the first place. But it turns out that the violent overthrow of a government (internally or externally) tends to result in the new government exerting extreme force to maintain its position against ""counter-revolutionaries"". Perhaps the unique thing about the American revolution is that it wasn't followed by a Terror, and the civil war was deferred for another century by interpreting "all men are created equal" to mean "not all men".