If the authoritarian communism is indeed carrying dramas, this is not a criminogenic study that really understand the phenomenon. Want to deal on the same level cases as different as Russia of Lenin and Pol Pot's Cambodia, for example, on the grounds that both claimed to be communism, but in historical, cultural, social and ideological very remote, c is simply unworthy of a process historian. This book, produced under the direction of a Stephane Courtois close to the extreme right, has mainly aims to assimilate any hint of social emancipation to the murderer Stalinism. And writing, in hollow, a pink book of capitalism. The difference is that the historians of the left, for the sake of intellectual honesty, did not seriously endeavor to explain capitalism by his crimes. How will this system be analyzed if we would just compile, among other Nazi concentration camps, shot of the Commune, colonial massacres, famine in Biafra, the butchery of 1914-18 or genocide Indians?