FDA: Ga. plant knowingly shipped tainted products

Evidence has surfaced showing that the Peanut Corp factory, responsible for the recent salmonella outbreak that killed 8 and sickened 575 people, had previously shipped products with full knowledge of contamination, though there were no reports of illness in those cases. Hypothetically, if investigators find that contaminated products were knowingly shipped in this case, what should the charges be? In my mind, it would seem that violating FDA regulations might not be a great enough charge - should those allowing potentially deadly food to be sold be tried on higher charges? Manslaughter, perhaps?