A scientific and reference publication that accumulates modern knowledge about the All-Russian Extraordinary Commission for Combating Counter-Revolution, Sabotage and Ex-officio Crimes under the Council of People's Commissars of the RSFSR. Gives an interpretation of terms (concepts) that reveal the main areas of activity of the bodies and troops of the Cheka: the fight against economic crimes; suppression of subversive actions of enemy intelligence services and counter-revolutionary organizations; ensuring the security of the Red Army and Navy; participation in the suppression of the insurgency, riots and the fight against political banditry; liquidation of opposition parties and others.