In Berlin, trouble comes where least expected. For five years the U.S. military post has operated a twice-weekly sightseeing tour of the city without incident. One day last week four U.S. buses, bearing 73 tourists, including twelve children, were returning from their customary swing through the Soviet sector when they ran into a tense, but typical, Berlin situation.
A group of Soviet-zone Volkspolizei, with police dogs, had just arrived at the Potsdamer Platz. Their mission: to prevent Germans from the British sector from distributing leaflets in the Soviet sector. As the four...