Even a guided revolution is hard to control once it begins to roll. A week after the U.S. stationed warships outside the Dominican Republic's three-mile limit to help finish the dynasty of slain Dictator Rafael Leonidas Trujillo,* it found itself caught in a power struggle. On one side was the middle-roading, anti-Trujillo National Civic Union (U.C.N.), backed by an aroused civilian populace that went on strike to support it. On the other was Trujillo's powerful armed forces, under General Pedro Rodriguez Echaverria.
One night last week, Dr. Viriato Fiallo, the widely respected,...