David Borisovich Ryazanov – leader of the Russian revolutionary and trade union movement, historian, bibliographer, archivist, Marxist. Founder and first head of the Marx and Engels Institute, director of which he was for more than ten years. Academician of the Academy of Sciences of the USSR. The Manifesto of the Communist Party – the first program document of scientific communism, which outlines the main ideas of Marxism, was written by K. Marx and F. Engels on behalf of the 2nd Congress (1847) of the Communist League as a program of this union. In this work, with brilliant clarity and brightness, a new worldview is outlined, consistent materialism, covering the area of social life, dialectics, as the most comprehensive and profound doctrine of development, the theory of the class struggle and the world-historical revolutionary role of the proletariat, the creator of a new, communist society (Lenin V.I.). More than two-thirds of the book consists of D. Ryazanov’s notes.