"Auschwitz was the largest mass extermination factory in human history. However, few people are aware that Auschwitz was a 100% subsidiary of IG Farben. On April 14, 1941, in Ludwigshafen, Otto Armbrust, the IG Farben board member responsible for the Auschwitz project, stated to board colleagues: "our new friendship with the SS is a blessing. We have determined all measures integrating the concentration camps to benefit our company."
Thousands of prisoners died during human experiments, drug and vaccine testing. Before longtime Bayer employee and SS Auschwitz doctor Helmut Vetter was executed for administering fatal infections, he wrote to his bosses at Bayer headquarters: "I have thrown myself into my work wholeheartedly. Especially as I have the opportunity to test our new preparations. I feel like I am in paradise."
After WWII, IG Farben attempted to shake its abominable image through corporate restructuring and renaming. So great has been their success that the public has no idea that it many of the men responsible for such atrocities, were able to carry on their work even after the collapse of the Nazi regime. Namely, a medical paradigm that relies almost exclusively highly toxic drugs. Such men were in control of the large chemical and pharmaceutical companies, both well before and after Hitler.
The Nuremberg Tribunal convicted 24 IG Farben board members and executives on the basis of mass murder, slavery and other crimes. Incredibly, most of them had been released by 1951 and continued to consult with German corporations. The Nuremberg Tribunal dissolved IG Farben into Bayer, Hoechst and BASF, each company 20 times as large as IG Farben in 1944. For almost three decades after WWII, BASF, Bayer and Hoechst (Aventis) filled their highest position, chairman of the board, with former members of the Nazi regime. Bayer has been sued by survivors of medical experiments such as Eva Kor who, along with her sister, survived experiments at the hands of Dr. Josef Mengele.[6] See also
Bayer."
https://www.sourcewatch.org/index.php/Rockefeller_Foundation#IG_Farben_.26_Auschwitz