Letter from Mexico

Behind tall, spiked railings of the Soviet embassy in Mexico —a vast villa with perfunctory inclinations toward the Baroque—the busiest spy organization in the hemisphere works 24 hours a day.

It has its long-range radio net (evinced by a frieze of rooftop aerials), its daily air link—the only one in North or South America—with Cuba. It has innumerable agents and contacts on both sides of the two thousand mile border with the United States.