I presume the White Glove Society are this games' "weird occult group".
Personally I think the ghouls in the Repconn facility classify as the "Weird occult group" more than the White Glove Society who are just upper class weirdos wanting money. With the WGS I plane to get a fat man and well....i'll leave the rest to imagination.
Found the ghouls to be the creepy vampire esk link between FO3 and FONV. However that doesn't hold a candle to the freaking Super Mutant with a damn wig. *shivers*