We are the sons of Ethel and Julius Rosenberg. We were young children — 10 and 6 years old, respectively — when our parents were put to death in the electric chair at Sing Sing for passing the secret of the atomic bomb to the Soviet Union. For many years after that, we believed our parents to be wholly innocent of the charges against them. But over the years, and especially as further evidence became available at the end of the Cold War, we began to question that belief. Now, 55 years after their execution, two recent revelations in our...