The hydrogen bomb, H-bomb, or hell bomb, as the fusion bomb had become popularly known, thus became a reality in the flash of the explosion of the first atomic bomb at 5:30 of the morning of July 16, 1945, on the New Mexico desert. As the men of Los Alamos, of whom I was at that time a privileged member, watched the supramundane light and the apocalyptic mushroom-topped mountain of nuclear fire rising to a height of more than eight miles through the clouds, they did not have to wait until they checked with their measuring instruments to know that a match sparking a flame of about 50,000,000 degrees centigrade had been lighted on earth for the first time. The size of the fire mountain and the end-of-the-world-like thunder that reverberated all around, told the tale better than any puny man-made instruments. And there in our midst, as we learned only recently, stood a Judas, Klaus Fuchs, a name that “will live in infamy” along with that of other archtraitors of history. By the greatest of ironies, there he was, this spy, standing right in the center of what we believed at the time to be the world’s greatest secret, waiting at that very moment to tell the Russians of our success and how we achieved it. As he confessed five years later, he betrayed to them the most intimate details not only about the A-bomb but about the H-bomb as well—details that he learned as a member of the innermost of inner circles. For, alas, he was a trusted member of the theoretical division, the sanctum sanctorum of Los Alamos. This select group of scientists, behind doubly and triply locked doors, discussed in whispers their ideas about the superduper. His associates at Los Alamos, who should know, sadly admit that Fuchs made it possible for Russia to develop her A-bomb at least a year ahead of time. It is my own conviction that the information he gave the Russians made it possible for their scientists to attain their goal at least three, and possibly as much as ten, years sooner than they could have done it on their own. Yet, though Fuchs confessed everything he told the Russians, the content of his confession is still kept a top secret from the American people, who sadly need information on one of the greatest problems facing mankind. The reason given is that we cannot actually be sure that Fuchs told the Russians all that he says he did, and, if published, his confession might, by his tricky design, give the Russians additional information. Of course, anything is possible for a warped mind such as that of Fuchs. Nevertheless, it seems highly implausible that this traitor, who went to the Russians voluntarily, should withhold any vital information from them for as long as five years. The best evidence that he didn’t is the Russian A-bomb.