The publication is a biographical directory of the Decembrists - participants in the first revolutionary uprising against the autocracy. It gives biographies of figures of secret societies of the Decembrists, participants in the December 14, 1825 uprising on Senate Square and speeches by the Chernihiv Regiment in Ukraine, as well as a wide range of people drawn into the orbit of the movement. The book publishes the "Alphabet to members of former secret malicious societies.." Compiled in 1827 by the ruler of the Investigative Committee A. D. Borovkov and containing in a generalized form the results of the investigation about each of the persons involved in it. In a special section of the reference book "Decembrists who were not included in Borovkov's Alphabet and identified by other sources," biographies of little-known participants in the movement are placed.