[BongoMcCat]

from bayers wiki page:

In 1925 Bayer merged with five other German companies to form IG Farben

IG Farben the made Zyklon B, and as a result it got split up after the war, into it's original companies, one of them bayer.

So, yes, you are mostly correct.

[Markoff]

I know I am correct, it was rhetorical question, not exactly sure why downvotes, if people are that clueless they don't know such general knowledge, same as Fanta is originally Nazi drink.