I spotted another example in a disturbing article in the December 26. 1987. edition of the New York Times. It describes a frightening example of the Warsaw Pacts ability to exploit the freedom of movement in America. From July to December 1987. five Czechoslovakian menthree technicians and two Communist party officialsbrought a specially equipped truck and an ultralight collapsible airplane into our country while traveling extensively on United States tourist visas. They were tracked by the FBI as they discreetly examined 17 of our sensitive military installations. between Niagara Falls and Arizona where they crossed into Mexico. Their electronically equipped truck parked for several days outside a sensitive U.S. communications facility near San Diego.