The circumstances that impelled Victor Grossman, a U.S. Army draftee stationed in Europe, to flee a military prison sentence were the icy pressures of the McCarthy Era. Grossman – a.k.a. Steve Wechsler, a committed leftist since his years at Harvard and, briefly, as a factory worker – left his barracks in Bavaria one August day in 1952, and, in a panic, swam across the Danube River from the Austrian U.S. Zone to the Soviet Zone. Fate – i.e., the Soviets –...