It may be an apocryphal story, but near the end of WW2, editor of Astounding Stories magazine John W Campbell published a story he commissioned about a team of scientists inventing an atomic bomb that was so close to the actual top secret Manhattan project that he was visited by the FBI.
Campbell then went point by point through the story to show them how any reasonable person could put the information together with no access to secret information. Then he told them that if such a secret project did exist, then it would likely be at Los Alamos, New Mexico.
At this, the agents were sure he must have gotten hold of classified information. However, he explained that it was a guess because an unusual number of his subscribers from around the nation – a lot of scientists and engineers – had recently changed their subscription addresses to Los Alamos.
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