The twentieth century has been fundamentally shaped by changes in Russia, where disaster in the First World War was followed by the fall of the Tsar. Nicholas II's replacement first by Kerensky's liberal government then by the Bolsheviks, and the subsequent Civil War and foreign intervention, led to the erection of a system of state tyranny previously unthought of. The Bolshevik regime, with its ideological hatred of other regimes, was a threat...