The former Argentinian dictator Jorge Rafaél Videla was a prominent member of the group of uniformed tyrants who in the 1970s seized power in Latin America and turned "disappear" into a transitive verb. If he never achieved the worldwide notoriety of his contemporary Augusto Pinochet, in Chile, it was not for want of trying. He has died aged 87 while in prison. "As many people as is necessary will die in Argentina," Videla told the region's army commanders, gathered in Montevideo, Uruguay, in 1975, "to protect the hemisphere from the international communist conspiracy." He was true to his word. Months...