When the word “filer” is mentioned, the image of a man in a bowler hat, with a cane, cautiously peeking out from behind a poster stand comes to mind. The attitude towards spies has always been distrustful and disgusting - as people who, by the nature of their activity, are engaged in something indecent. Man is by nature curious, and therefore often eavesdrops and spies on others, but cannot stand it when they start spying on him. Especially if the person has a history of sins, and the surveillance is carried out by professional spies. The latter by no means became extinct like mammoths, but only slightly modified. Because since ancient times, no one has come up with a better (and most importantly, simpler) way to obtain reliable operational information...