This essay is a presentation and a critic of the dialectical philosophies from Hegel, Marx and Engels up to now. First are reviewed the economical and economical aspects, including both failing theses of capital accumulation and impoverishment. The Bourdieu’s interpretation of the Weber’s approach is questioned. It is explained how the proletariat went to suicide. Then take place a review of the main principles of the dialectical materialism, including definition of the category concept and the related negation postulate. Finally are analyzed the concepts of alienation and universalization within the marxist doctrine.