In The Road to Terror, revolutionaries tell how their dream descended into a nightmare of terror and execution. They speak as exiles in Paris, a city that is preparing to celebrate the glories of the first mass revolution of 1978. Behind its strange images, the struggle for power in the Iranian revolution has followed a pattern uncannily similar to many of the great revolutions of the past: just as 200 years ago in France, the Iranian revolution has gone down the old road from liberation to repression, the road to terror.

• Documentary