Private correspondence of Russian citizens in 1883: from the archive of the police department. From the post of chairman of the Presidium of the Supreme Soviet of the USSR Nikolai Podgorny, 1971
One of the channels, obtaining information about the mood of citizens, is the per lustration of letters, in other words, the illegal opening of private correspondence by special services. In pre -revolutionary Russia, employees of the police department did this. "An extract from a letter without a signature, from Yekaterinoslav, dated August 1, 1883, to the student Moses Markovich Davidovich, to Kyiv, the university.