As the Ford Taurus slowly approached the signal site, hidden FBI agents readied for a possible arrest. For weeks they had been staking out a path in Foxstone Park in Vienna, Virginia, outside Washington, D.C. Their elusive quarry was a Soviet mole in the FBI, codenamed “Ramon Garcia.” ver the course of more than two decades, “Ramon” had done incalculable damage to the United States’ security, selling Top Secret information to the Soviet GRU (military intelligence) and KGB, and to the KGB’s Russian successor agency, the FSB, and its foreign arm, the SVR. Would “Ramon” stop this time? More than...