A detailed biography of a prominent Russian revolutionary, statesman of the USSR A. A. Solts (1873-1945) is laid down for the first time in the article. It is reported that before the revolution he was known for his publication work, the publication of a whole series of revolutionary issues. It is noted that it was during this period that his circle of communication was formed, which included such famous revolutionary figures as F. E. Dzerzhinsky, brothers M. I. and B. I. Goldman, I. V. Stalin and many others. The article clarifies his date of birth, in details and accurately covers the circumstances of his education at Vilna Gymnasium and at St. Petersburg University. The content of his pre-revolutionary activity, including his relationship during this period with I. V. Stalin, is revealed. The author draws attention to the fact that after the revolution, Solts continues to work in the central Bolshevik publications, and later becomes one of the leaders of the Workers’ and Peasants’ Inspectorate. Based on archival data, his activities in this body of Soviet power, the role of the inspectorate in the formation of the USSR, as well as in the formation of punitive and repressive organs of Soviet power is described in the article. His attempts to uphold the principles of socialist legality are described. His confrontation with Y. Vyshinsky is shown.