Sakharov created a number of inventions for the Soviet military industry during the Second World War. He earned his Ph. D. in 1947 and was included in the top-secret Soviet thermonuclear research group under Igor Tamm. In 1949-50 Sakharov became the co-inventor of the controlled hydrogen reaction. Today he is known as "the father of the Soviet hydrogen bomb." He was secretly awarded the State Prize by Joseph Stalin, who had a personal meeting with Sakharov and Lavrenti Beria, the chief of NKVD/KGB.
After giving the hydrogen bomb to Joseph Stalin, Sakharov went through a dramatic moral transformation. He wrote in his 'Memoirs' that from 1952-1961 he grew to realization that his invention is extremely harmful in the hands of politicians, and that it caused him serious moral pain. Sakharov rose to become a staunch opponent of the nuclear tests and made a political statement in 1961, making Nikita Khrushchev angry. During the Cuban missile crisis, Sakharov had a clear vision of the danger that his mighty invention may cause in the hands of undereducated politicians, who exterminated millions of their own people. Sakharov voiced his opinion in 1966-1967 on defense of the political prisoners in the USSR; at a time when Aleksandr Solzhenitsyn was being terrorized by the KGB.
Sakharov's integrity took him on a