In 1981 concern was growing over an unidentified infectious disease associated with immune system collapse that would later become known as AIDS. In the U.S. it was found mostly in homosexual men and intravenous drug users, while in France doctors were finding it in a more diverse group of patients.[4] On July 16, 1982, the United States Centers for Disease Control and Prevention (CDC) reported that three hemophiliacs had acquired the disease.[3]
Epidemiologists started to believe that the disease was being spread through blood products, with grave implications for hemophiliacs who had routinely injected themselves with concentrate made from large pools of donated plasma, much of which was collected by commercial paid-donor plasmapheresis prior to routine HIV testing, often in U.S. cities that had large numbers of homosexuals and intravenous drug users and in some U.S. prisons and underdeveloped countries during the four or five years of the late 1970s through early 1980s before AIDS was even heard of
Not just Bayer
https://en.wikipedia.org/wiki/Contaminated_haemophilia_blood_products