Final answer:
Hoffman-La Roche was involved in a notorious case of knowingly hiding a dangerous product. The company was part of an international cartel of vitamin manufacturers and was prosecuted for price-fixing.
Step-by-step explanation:
The company involved in a notorious case of knowingly hiding a dangerous product is Hoffman-La Roche. In the late 1990s, Hoffman-La Roche was part of an international cartel of vitamin manufacturers that reached agreements on how much to produce, how much to charge, and which firm would sell to which customers. This cartel pushed up the prices of high-priced vitamins, and when caught, Hoffman-La Roche pleaded guilty and faced fines and jail time for one of its top executives.