Joseph Losey originally offered the part of Leon Trotsky to Dirk Bogarde, with whom he had made five other films. Losey admitted that the script was terrible, but told Bogarde that it would be revised. Bogarde turned the role down, embittering Losey, who felt that Bogarde didn't trust him. Richard Burton, who had worked with Losey on Boom! (1968) did trust Losey enough to take the part, even though he was shown the same script.