Here we are, a half-century on since the execution of Julius and Ethel Rosenberg. The Rosenbergs are truly historical figures now, but for a small fraction of the population their fate still has the power to generate yesterday's heat. Were the Rosenbergs framed? Did they do anything? If they did do anything, was it anything much? Robert Meeropol, the younger son of the Rosenbergs, has lived his life close to home -- that is, among people who believed his parents were innocents, martyrs to a government bent not on catching Soviet spies but on crushing political dissent. Given the evidence...