"Operation Trust" was a Bolshevik counterintelligence operation run from 1921 to 1926 aimed at neutralizing opposition by creating the false impression that a powerful group of military leaders had organized to stop the communists' takeover.

[…] The one Western historian who had limited access to the Trust files, John Costello, reported that they comprised thirty-seven volumes and were such a bewildering welter of double-agents, changed code names, and interlocking deception operations with “the complexity of a symphonic score”, that Russian historians from the Intelligence Service had difficulty separating fact from fantasy.

https://www.informationliberation.com/?id=62008