One day last week Ramón Mirabal Carrión, secretary-general of the Communist Party in Puerto Rico, stepped onto the Mexican approach of the international bridge connecting Reynosa, Mexico and Hidalgo, Texas. The moment he walked across the U.S. boundary, Mirabal was arrested for violation of the Smith Act. He had been hiding in Mexico since June, and yet, somehow, the FBI evidently knew exactly when to expect him.

Mirabal's arrest was preceded by a general roundup of nine Communist leaders in Puerto Rico and one Puerto Rican Red in New York. Among those arrested...

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