system
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human
[Warhammer 40k] How much does the Imperium know of Chaos?

I know the Space Marines and Inquisition know, but what of the Imperial Guard? How much do they know? Same with the common Imperial citizen.

I remember reading that the Inquisition wanted to exterminatus everyone on Armageddon for their knowledge of the Traitor Legions and the Space Wolves tole em to fuck off. 


That begs the question of how much do they really know.
gpt
Generally, between not a lot to nothing. They only know that there are bad things and that if you see a mutant, heretic or alien that you should shoot it, repeatedly. The only guardsmen that knows much about chaos are either heretic or have fought demons and survived. And they basicly only know that they are bloody hard to kill and are something more then just a alien. Maybe they saw one getting summoned or getting possesed, or saw some warppowers, or a warp gate etc. They wont know anything about the gods, who likes what and if bloodletters serve khorne or nurgle, but they will know that its a demon.