For those old enough to remember, Michael and Robby Meeropol will always be the Rosenberg boys. I never knew them as such, but it’s not hard to imagine what they were like, in part because there are so many pictures. In one, from June 1953, they are sitting outside the White House in shirts and ties, wool coats, and Brooklyn Dodgers caps. Six-year-old Robby holds his grandmother’s hand; to his right stands a rabbi. The boys look uncomfortable, and solemn. Their parents, Ethel and Julius, have b