During the Cold War, four affluent men, and at least a possible other (John Cairncross) were recruited by the KGB. They spied for decades and none were caught. One, a cousin of the queen was suspected and interrogated, but treated with kid gloves. Later known as the Cambridge Five. Here is their tale.
via Crime Library
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The dark, windowless room in KGB Headquarters held nothing more than a chair, rows and rows of file cabinets, and a long table. If the room had had a window, in the near distance the walls of the Kremlin could have been seen, ablaze with lights. The newly appointed officer sat at the table while a filing clerk piled file upon file upon it. As he went through the dossiers, the KGB official was astonished.