IIRC,
Dead Beat mentioned that the White Council was hunting down Kemmler during WWI, but didn't get him for good until later...so WWII could be the final end of Kemmler.
Otherwise, there are indeed the occult departments of various governments. Heck, I can easily see one of Kemmlers students heading up the Nazi Ahnenerbe Society. Or, even Kemmler himself! Remember, souls who die mad usually come back as ghosts. Who knows, maybe Kemmler's ghost was Hitlers secret weapon? The White Council would be
very invested in the outcome of WWII if such was the case.
As far as Victorian England, take a look at the
Wild Talents supplement,
Kerberos Club, By Arc Dream/Cubicle 7. Granted, it's about supers in Victorian England, but the rest still works GREAT for an occult-themed game. Instead of super powers, the club members sling eldritch power...instead of superscience, eldritch-tech is invented.
Also, speaking of period games,
Deadlands, by Pinnacle Entertainment Group, is a good sourcebook for the Weird West.
Arc Dream also puts out
Grim War, which is another supers game for the American Civil War era. Heck, even
Godlike can give you some great stuff for WWII gaming.
Yeah, I know I'm pimpin' Arc Dream's stuff pretty heavily, but it's for good reason. Almost all of their period stuff is well researched, and a good read. Not as exciting as
Dresden Files, of course, but still it's not dry like a textbook.
Hope that's been of some help and not just the ravings of a mad-man :p
-EF
