stay-human:

These corporations, if they were individual human beings, would be locked up for life. Instead, they continue raking in the big bucks. Human rights abuses, murder, war, eco disasters, and animal exploitation keep these evil companies raking in the green. Prepare to be disgusted.

I don’t think the list is in any particular order. Even if you don’t agree with all of them (eg. the cigarette company) most of them are legit horrible. I’m posting a summary but I recommend reading the full article: http://brainz.org/15-deadliest-us-corporations/

1. Chevron : (then Texaco) discharged 18 billion gallons of toxic water into the rain forests of Ecuador without any remediation, destroying the livelihoods of local farmers and sickening indigenous populations. Chevron was responsible for the death of several Nigerians who protested the company’s polluting, exploiting presence in the Nigerian Delta. Chevron paid the local militia, known for its human rights abuses, to squash the protests, and even supplied them with choppers and boats. The military opened fire on the protesters, then burned their villages to the ground.  
2. DeBeers : was knowingly funding violent guerrilla movements in Angola, Sierra Nevada, and the Congo with its diamond purchases. In Botswana, DeBeers has been blamed for the “clearing” of land to be mined for diamonds — including the forcible removal of indigenous peoples who had lived there for thousands of years. The government allegedly cut off the tribe’s water supplies, threatened, tortured and even hanged resisters.
3. Tyson : Even if you don’t care about the horrendous animal abuse that has been documented in Tyson’s factory farms, you have to flinch at Tyson’s appalling environmental abuses and workers’ rights violation- Tyson has allowed e coli tainted beef to enter the food supply. A recent study showed that Tyson’s chickens were the most salmonella-and-campylobactor filled poultry of all the major suppliers and has even been accused of human trafficking to supply themselves with cheap labor.  
4. Smith & Wesson : In a study of the top ten guns involved in crime in the U.S., the first was the Smith & Wesson .38 Special.
5. Phillip Morris : is the largest manufacturer of cigarettes in the U.S.
6. Haliburton : is a huge “oilfield services” company, profited big time from the U.S.’s invasion of Iraq when Cheney called in his boys to quell burning oil wells — and to “help” the Iraq oil ministry pump and distribute oil. Haliburton has also been implicated in countless oil spills, including the BP disaster of 2010. 
7. Coca Cola : corporation has wrought devastation in India, where its factories use up to one million liters of water per day, leaving tens of thousands of nearby residents dry during the drought months. Then the factories dispose of the wastewater improperly, contaminating whatever water is left.  A lawsuit in 2001 accused Coca Cola of hiring paramilitaries in Columbia which suppressed unionization in the cola plant there through intimidation, torture and murder.
8. Pfizer : the largest pharmaceutical corporation in the U.S., pleaded guilty in 2009 to the largest health care fraud in U.S. history. Pfizer decided to use Nigerian children as guinea pigs. In 1996, Pfizer traveled to Kano, Nigeria to try out an experimental antibiotic on third-world diseases such as measles, cholera, and bacterial meningitis. They gave trovafloxacin to approximately 200 children. Dozens of them died in the experiment, while many others developed mental and physical deformities. According to the EPA, Pfizer can also proudly claim to be among the top ten companies in America causing the most air pollution.
9. ExxonMobil : is perhaps best known for the 1989 Exxon Valdez oil spill which resulted in 11 million gallons of oil contaminating Prince William Sound. But they have also been responsible for a huge oil spill in Brooklyn and for aiding in the decline of Russia’s critically endangered grey whale because of drilling in its habitat. The Political Economy Research Institute ranks ExxonMobil sixth among corporations emitting airborne pollutants in the United States.
10. Caterpillar : supplies the Israeli army with bulldozers which are used to demolish Palestinian homes — sometimes with the people still inside. In 2003 a Caterpillar bulldozer ran over and killed Rachel Corrie, an American protesting in Gaza who stood in front of the tractor to prevent the destruction of a Palestinian home.
11. Ringling Brothers and Barnum and Baily : “The Cruelest Show on Earth” is famous for its abuse of wild animals.
12. Monsanto : Monsanto’s list of evils includes creating the “terminator” seed which creates plants which never fruit or flower so that farmers must purchase them anew yearly, lobbying to have “hormone-free” labels removed from the labels of milk and infant milk replacer (through bovine growth hormone is believed to be a cancer-accelerator) as well as a wide range of environmental and human health violations associated with use of Monsanto’s poisons — most notably “Agent Orange.”
13. Nestle : crimes against man and nature include massive deforestation in Borneo — the habitat of the critically endangered orangutan — to grow palm oil, and buying milk from farms illegally-seized by a despot in Zimbabwe. Nestle attracted worldwide boycott efforts for urging mothers in third-world countries to use their infant milk replacer instead of breastfeeding, without warning them of the possible negative effects. Supposedly, Nestle hired women to dress as nurses to hand out free infant formula, which was frequently mixed with contaminated water, or the children starved when the formula ran out and their mothers could not afford more and their breast milk had already dried up from disuse.
14. British Petroleum : Who can forget 2010’s oil rig explosion in the Gulf Coast which killed 11 workers and thousands of birds, sea turtles, dolphins and other animals, effectively destroying the fishing and tourism industry in the region? This was not BP’s first crime against nature. In fact, between January 1997 and March 1998, BP was responsible for a whopping 104 oil spills.
15. Dyncorp : is best known for its brutality in impoverished countries, for trafficking in child sex slaves, for slaughtering civilians in Iraq and Afghanistan, and for training rebels in Haiti. This privatized military company is often hired by the U.S. government to protect American interests overseas — and so the government can claim no responsibility for Dyncorp’s actions. 

So yeah.