Foreword Independently of the reactions towards the right [which took place in Russia after the October Revolution of 1917] there also occurred, during and after the same period, a series of movements in the opposite direction. These were revolutionary movements, which fought the Bolshevik power in the name of true liberty and of the principles of the Social Revolution which that power had scoffed at and trampled underfoot. Indeed, even within the ranks of the government and of the Communist Party itself, movements of opposition and revolt were provoked by the stifling statism and centralism, the terrifying tendency towards bureaucracy, the flagrant social impotence and the shameless violence of the Bolsheviks. It was thus that, in the summer of 1918, the Left Social-Revolutionaries, who until then had participated in the government, left it, broke with the Bolsheviks, and declared against them. They soon succumbed under the blows of repression.