DuPont. Here's just a little tidbit:
Between 2007 and 2014 there were 34 accidents resulting in toxic releases at DuPont plants across the U.S., with a total of eight fatalities.[93] Four employees died of suffocation in a Houston, Texas, accident involving leakage of nearly 24,000 pounds (11,000 kg) of methyl mercaptan.[94] As a result, the company became the largest of the 450 businesses placed into the Occupational Safety and Health Administration's "severe violator program" in July 2015.
In Anniston, Alabama, plaintiffs in a 2002 lawsuit provided documentation showing that the local Monsanto factory knowingly discharged both mercury and PCB-laden waste into local creeks for over 40 years.[220] In 1969 Monsanto dumped 45 tons of PCBs into Snow Creek, a feeder for Choccolocco Creek, which supplies much of the area's drinking water, and buried millions of pounds of PCB in open-pit landfills located on hillsides above the plant and surrounding neighborhoods.
These are the kind of companies that inspired the cartoon villains of the 1980s that just dump pollution because.