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Los Angeles Times:
A provocative political thriller that is as troubling today as when it came out in 1970. Maybe more so.
The movie survives beautifully both as an elegant thriller and as a study of the twisted infantilism that shapes the fanatic heart.
Its portrait of a loner and his lusts comes up frighteningly fresh, and the whole conceit would collapse without the muscular, rousing presence of Gian Maria Volonte in the central role.
A paranoid police procedural, a perverse parable about the corrupting elements of power, and a candidate for the greatest predated Patriot Act movie ever ...