Growing up in Miami, young Cuban Americans rolled their eyes whenever the older generation warned there were spies everywhere. Agents of Fidel Castro who blended into el exilio and reported back to the island? It seemed too dime-store-novel to be true. But over the years, proof poured in. The latest: alleged Cuban agents at Florida International University. The old-timers have felt vindicated every time a spy is discovered -- just because they were paranoid didn't mean spies weren't out to get them. But just how damaging have those spies been? Whatever intelligence they may have swiped, their greatest toll could...