Biography of the American physicist who led the U.S. effort to develop the atomic bomb during World War II, only to find himself suspected as a security risk in the 1950s.Biography of the American physicist who led the U.S. effort to develop the atomic bomb during World War II, only to find himself suspected as a security risk in the 1950s.Biography of the American physicist who led the U.S. effort to develop the atomic bomb during World War II, only to find himself suspected as a security risk in the 1950s.