This report from Vasili Mitrokhin presents evidence of an anonymous writer—“Mrakobes”— who between 1960 and 1961 delivered anti-Soviet letters and caricatures of government and party leaders to foreign embassies and Soviet institutions in Moscow. The letters were written by hand and contained Church Slavic fonts and constructions. They were put in a letter box at different times of the day, in different parts of Moscow. Each set of letters was put in a different letter box.
Examination of text, envelopes, and paper demonstrated that the anonymous author was familiar with rare literature, had a good command of musical and church lexicon, and made good use of figures of speech. The author was also estimated to be a middle-age male with education in humanities. From some letters intercepted by the KGB, operatives obtained his fingerprints. They also observed that one letter box was frequented by the anonymous writer more than others. The KGB laid an ambush. The hideout for the operatives was camouflaged as a storage room and a light signal was set up.
Several weeks later, on February 5, 1961 “Mrakobes” delivered four letters. A surveillance team identified him as S.F. Petrakov (born 1924). To verify it was the right person, the team wanted to check his fingerprints against the earlier obtained fingerprint. Petrakov was invited to a medical inspection, during which an operative posing as a doctor fingerprinted him with a magnifying glass. Petrakov’s identity was confirmed. He confessed to having produced around 100 anti-Soviet documents that had been mailed by post at various times.