Does the third volume of the collection of documents "Echo of the Great Terror" include "letters to the authorities" of the state security officers of the NKVD of the USSR? organizers and executors of mass punitive operations of 1937? 1938, who found themselves in 1939? 1941. under investigation, arrest and trial during a large-scale campaign to restore socialist legality, the organizer and conductor of which was the union center. In addition, the collection includes various complexes of documents that set the context for the campaign to discipline the NKVD, reveal its goals and mark the boundaries.