Academy

Well, here's the first clue, and I've already learned a lesson. You can't mix up the chronicle with the clue itself. You were misled by the fake mustache and made a beautiful, but incorrect, connection to SH. But no, the intended person was Comrade Stalin. Moreover, there was even a correct candidate for execution.
The killer is the Victor.
He lives in Donetsk, which was previously called Stalino.
The right to pose the next riddle is open. Whoever wants to, let them pose it.