Whittaker Chambers is one of the most controversial figures in modern American history a former Communist spy who left the party, testified against Alger Hiss before the House Un-American Activities Committee, and wrote a classic autobiography, Witness. Dismissed by some as a crank, reviled by others as a traitor, Chambers still looms as a Dostoevskian figure over three decades after his death in 1961. A man of profound pessimism, rare vision, and remarkable literary talents, his continuing importance was attested to when Ronald Reagan posthumously awarded him the Medal of Freedom in 1984....