When new information about Americans who had cooperated with the Soviet KGB began to emerge in the 1990s, no individual case generated as much controversy as that of the journalist I.F. Stone, who had long been installed in the pantheon of left-wing heroes as a symbol of rectitude and a teller of truth to power before his death in 1989. Charges about Stone’s connections with the KGB have been swirling about for more than a decade, prompting cries of outrage among his passionate followers. Until now, the evidence was equivocal and subject to different interpretations. No longer.