Anyone who's got a fuller or more confidence-building source is welcome to chime in, by the way.
But now things get even more tenuous, as I edge still farther out onto the speculative ice. A review on the Mannix novel's Amazon page (I know) steps up the game still further, to wit:
Wolf attacks on humans were not uncommon in Europe before modern times, and, even in modern times, in the aftermath of WW2 the wolf population exploded in eastern Europe and Russia. They became such a threat that the Soviet Army mounted a campaign to exterminate them, killing over 100,000 wolves between 1945 and 1950.
Attempting to trace this wisp of a story, I did turn up the series of wolf attacks in Kirov (fmr. Vyatka) in 1944-1951, which is a specific case of the general phenomenon adduced by reviewer Bryan O'Driscoll, but by itself can't possibly add up to 100,000 wolves killed in five years by the Red Army.
The existence of a People's Revolutionary Wolf Purge would not only do my grim ironic heart good, but would also come in very handy if I ever get around to writing a werewolf game of any sort. (Specifically my GUMSHOE game of werewolf counter-insurgency, Gegen Werwolf.) Which is why I appeal to you, my beloved readership -- if you've got a lead on said putative pursuit, I would fain run it down.