RAUL RIVERO, Cuba's foremost independent journalist and one of its best poets, knew for years that he could be arrested at any moment by Fidel Castro's police, simply because he dared to report and write freely about his country. But he refused to be intimidated. "Nobody, no law, can make me take on the mentality of a gangster or other criminal simply because I report the arrest of a dissident or bring to light the prices of the basic alimentary products for survival in Cuba or edit a note saying that it seems like a disaster to me that more...