Gabriel García Márquez's support of Fidel Castro takes the novelist down a bitter street. A wave of denunciations against the comandante, unleashed by the West's most important intellectuals, has swamped the Nobel laureate. It all happened as a result of the recent executions of three young men, shot dead ''to prevent an American invasion'' -- as if Castro had become an Aztec priest who conjures fate by means of human sacrifices. Suddenly, the mutiny was directed at García Márquez, the prior of Latin American literature. ''Where is García Márquez's signature, in the face of this limitless cruelty?'' everyone asked. The...