Adam B. Ulam - professor of history and state law at Harvard University, author of the famous book "Ideologies and Illusions." Ulam connects a detailed study of the origins of Bolshevism in Russia with the image of the leader of the revolution - Vladimir Ilyich Ulyanov-Lenin. The narrative objectively reflects the picture of the emergence and development of Bolshevism in Russia. The book highlights rare facts from the life of Lenin's associates. It tells about the origin of the Ulyanov family, income and much more, which scientists and researchers were previously silent about.