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Why was J. Robert Oppenheimer accused of being disloyal to the United States?

J. Robert Oppenheimer (1906–1967) was an American physicist (a scientist specializing in the interaction between matter and energy) who helped develop the atom bomb and then became a vocal opponent of the development of the more destructive hydrogen bomb. Oppenheimer's position led his critics to accuse him of being disloyal to the United States.

Oppenheimer was the director of the Los Alamos, New Mexico, laboratory where the first atomic bomb was developed and built. Following the end of World War II (1939–45) and the U.S. bombings of Nagasaki and Hiroshima, Japan, Oppenheimer realized the potential for mass destruction unleashed by the weapon he had helped to invent. He became an outspoken opponent of the use the atomic bomb and the development of the hydrogen bomb. He also served on both the general advisory...

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