In the 1980s the Bayer corporation sold a hemophilia drug that was made from processed donated human blood. In the early days of the AIDS epidemic it was discovered that the product was contaminated with HIV. They were forced to take it off the shelves in America and Europe. Bayer decided there had been too much financial investment in the product and rather than destroy the inventory they sold it in Latin American and Asian countries instead. They even continued to produce it for a few months until their supplies ran out.
There's no way to know how many people were infected with HIV as a result but at a bare minimum it had to have been in the thousands, plus however many those people may have unknowingly infected in turn and so on. In the 1980s when AIDS was pretty much a guaranteed death sentence.
Bayer knowingly killed probably tens of thousands of people and no one went to jail. $600 million settlement.
EDIT: Just a clarification, this treatment was not a dry pill that you swallow. That would be pretty unlikely to transmit HIV as some people have said. It was basically taking blood and removing the rejectable parts and concentrating clotting factors and injecting that into hemophiliacs. In terms of HIV risk it was basically a blood transfusion.