The remains of General Francisco Franco lie in an immense mausoleum near Madrid, built with the blood and sweat of twenty thousand slave laborers. His enemies, however, met less-exalted fates. Besides those killed on the battlefield, tens of thousands were officially executed between 1936 and 1945, and as many again became "non-persons." As Spain finally reclaims its historical memory, a full picture can now be given of the Spanish Holocaust-ranging...