Moscow city. Institute of Marxism-Leninism under the Central Committee of the CPSU. Books, manuscripts, letters, photographs and other documents from the collection of V.I. Lenin, including documents found in foreign archives. The city of Leningrad. State Library named after Saltykov-Shchedrin. Scientist G.S. Zhukov is working with the G.V. Plekhanov Foundation, gives interviews (synchronously). Scientist I. M. Mrachkovskaya gives interviews (synchronously). As an illustrative material, the film includes shooting of cities: Paris, New York, Stockholm, Amsterdam, Krakow, Poronino, Berlin (footage of the chronicle).