An overview of the All-Russian scientific conference “State and revolution. The 100th anniversary of the Great October revolution”, organized by the department of theory of state and law and politology of the law faculty of Moscow state University M.V. Lomonosov and the editorial board of the journal “State and Law”. It shows the influence of the October revolution on the formation and development of the Soviet state. The sources of revolutionary law, state-legal aspects of the 1917 revolution, the attention is paid to the revolutionary and evolutionary change in modern history and the role of law, as well as the first Soviet legal journals. Reflect the issues of theoretical preparation of the Great October revolution in Russia. Why the October 1917 was a historical inevitability? The participants of the conference were also devoted to the revolutionary ideology in the theory of law and state, to the revolutionary sense of justice in the history of Russian statehood, and many other issues.