The book explores the political biography of one of the most controversial figures in the revolutionary movement of the 20th century. Leon Trotsky. Now its true role in our history is being restored. The author, Doctor of Historical Sciences, analyzes Trotsky's activities without diminishing his merits and without exaggerating mistakes, seeks to objectively assess his work in leading party and state posts. A special place is given to considering the strengths and weaknesses of Trotsky's struggle with Stalin's personal power regime, the reasons that led to the creation of the IV International.