But it made no difference and Fuchs was cleared to go to America to work on the atom bomb.
To some it might have seemed at odds with the new era of the atom bomb and jet-powered flight.
It has also failed to significantly slow Iran's progress towards the atom bomb.
Truman entered the White House not knowing that America had the atom bomb.
Taniguchi was just 8 years old and just a mile and a quarter from ground zero when the atom bomb hit Hiroshima.
The blast hundreds of times more powerful than the atom bomb dropped on Hiroshima 37 years later felled 80m trees over 2, 150 square kilometres.
As they waited to disembark in India, Mr Davies heard on the radio that an atom bomb had been dropped on Hiroshima in Japan.
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She carried the atom bomb to Guam, where it was then loaded onto the B-29 bomber, the Enola Gay, for its fateful mission over Hiroshima.
After leaving Wales in 1943, Fuchs went to the United States to work on the Manhattan Project that ultimately led to the Hiroshima atom bomb.
Instead of picking on countries like Iran, which do not possess an atom bomb, the rest of the world should, he said, rid itself of existing nuclear weapons.
He got in contact with Soviet officials in New York and duly passed on the secrets of the atom bomb to his Soviet contact, Harry Gold.
Taking just one example, the development of much of modern physics (from quantum theory to the creation of the atom bomb) owes its success to teamwork.
In one quite different picture, however, an atom bomb (its cloud painted in familiar tiny dots) is being detonated at the geographical heart of the Australian continent.
In fact, Libya's effort to concoct an atom bomb never got very far, and its small stock of rudimentary chemical weapons is probably already in the rubbish bin.
It emerged that in her capacity as a secretary at the British Non-Ferrous Metals Research Association in London, she had photographed documents on the British atom bomb and passed them on to the KGB.
The documents started the hunt for spies such as Kim Philby, a British foreign-policy adviser, and Klaus Fuchs, a scientist passing on technical details about the atom bomb to the Soviet Union.
So far his policies have led to the near disintegration of Israel's peace with Egypt, the establishment of a Fatah-Hamas unity government in the Palestinian Authority, and to Iran's steady, all but unimpeded progress towards the atom bomb.
He signed the letter to Franklin Roosevelt warning that it may be possible to build an atom bomb, and the letters of his famed equation relating energy to mass hover in our minds when we picture the resulting mushroom cloud.
More important, Mr Obama's dazzling footwork has so far failed to stop the most acute nuclear peril that Iran will develop an atom bomb in the coming years, strengthening the radical camp in the Middle East and prompting neighbours to go nuclear.
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