"He was the genius of the nuclear weapons age and also the walking, talking conscience of science and civilisation; most of the great questions surrounding him as a person were the greatest questions of that time. He was born into an intellectual New York Jewish family and as a young man experienced the revolution in theoretical physics in the 1920s at first hand in Europe, before settling in California and building a world-class research centre there. Though he had no record as a manager, when war came he was chosen as the Manhattan Project's chief scientist and his inspirational leadership saw it through to success. Peace found him a national hero and a powerful voice in Washington, but he was also increasingly anxious about the drift into Cold War. These qualms made him enemies, so his pre-war left-wing past was dredged up and, at those 1954 hearings, he was subjected to what one observer called a "dry crucifixion". … Not a shred of credible evidence was ever produced to suggest that the man was disloyal, still less that he was a spy. The worst that could be proved against him was one or two lapses of judgement in dealings with left-wing friends in the early years of the war — piffling faults, as Isidor Rabi pointed out, when set beside his achievements. So demented were his enemies that, even after what they described as his "unfrocking" — the official decision that he did indeed pose a risk to national security — they insisted he was on the brink of defecting to the Soviet Union and so must continue to be followed and bugged wherever he went."