The history of the life and environment of the famous Russian socialist and liberal figure Pyotr Struve (1870–1944) - his political and ideological struggle before the outbreak of the Civil War in Russia: the path of the leader of Russian Marxism in the 1890s, the author of the first “Manifesto” of the RSDLP (1898) , one of the fathers of the social-liberal Cadet Party in the 1900s, ideologist of the classic ideological collections “Problems of Idealism” (1902), “Vekhi” (1909), “From the Depths” (1918), editor of the famous, illegal for Russia, publication “Liberation” "(1902–1905), the classic thick magazine "Russian Thought" (1907–1918) and other press organs. The biography is preceded by a historiographical introduction summarizing the results of the research and publication of the legacy of P. Struve. The appendix to the biography contains a new collection of works by P. Struve compiled for the first time Struve - those of his political texts that, for political reasons, he himself did not include in his last collection of articles “Patriotica” (1911), or were published after this book and therefore were not republished by him either in Russia or in exile.