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In page Tsar Bomba:

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Andrei Sakharov was one of the most prominent speakers against nuclear proliferation. He played a key role in signing the 1963 Partial Test Ban Treaty. Sakharov became an advocate of civil liberties and reforms in the Soviet Union. In 1973 he was nominated for the Nobel Peace Prize and in 1974 was awarded the Prix mondial Cino Del Duca. He won the Nobel Peace Prize in 1975, but was not allowed to leave the Soviet Union to collect it. His wife Yelena Bonner read his speech at the acceptance ceremony.[citation needed]