I had my latest Executed Today entry run today: Gennady Modestovich Mikhasevich, an astonishingly prolific serial killer from the Belarusian SSR who murdered somewhere between 36 and 55+ people in fourteen years.
There were two huge problems that prevented the cops from capturing him sooner. The first problem is that, as with the Andrei Chikatilo case, the investigators believed serial murder was the product of decadent capitalism and could not possibly exist in a socialist paradise like the Soviet Union. The second problem is that Gennady Mikhasevich was a member of the Soviet equivalent of the Neighborhood Watch and was therefore much better informed about the movements and activities of the police than the average person.
This is a really interesting story. HBO made an awesome movie about Chikatilo, called Citizen X, which you can stream for free if you have Amazon Prime. I think the Mikhasevich story would also be movie-worthy. As far as I can tell there are no English-language books at all about this man, although there is probably something in Russian.