Vadim Zakharovich Rogovin (1937-1998) - Soviet sociologist, philosopher, historian of the revolutionary movement, author of a seven-volume history of the internal party struggle in the CPSU (b) and the Comintern in 1922-1940. In this study, for the first time in domestic and world science, the most extensive factual material from the most dramatic period of our history (from 1922 to 1941) was comprehended and linked into a single historical concept of development (completely different from the one that was imposed on us in Soviet times, and the one that is being imposed now). g.).The sixth volume analyzes the state of Soviet society after the “great purge” of 1936-1938. The international situation that was developing in the world on the eve of the world war is described, and the events related to the preparation and signing of the Soviet-German Pact of 1939 are considered. A special section is devoted to the role of L. Trotsky in the history of the birth of the IV International, in preventing the danger of fascism. Based on recently published archival materials and memoirs, the first stages of preparation for the murder of Trotsky are highlighted.