While he received funding from the Agent Orange producing Dow Chemical Company, the US Army, and Johnson & Johnson, Dr. Albert Kligman used prisoners as subjects in what was deemed "dermatological research". The dermatology aspect was testing out product the effects of Agent Orange on the skin Needless to say the injecting of, or exposure to, dioxidin is beyond monstrous to voluntarily do to any human. Kligman, though, injected dioxidin (a main component of Agent Orange) into the prisoners to study its effects.
What did happen was that the prisoners developed an eruption of chloracne (all that stuff from high school combined with blackheads and cysts and pustules that looked like the picture shown to the left) that develop on the cheeks, behind the ears, armpits, and the groin -- yes, the groin.Kligman was rumored to have injected 468 times the amount he was authorized to. Documentation of that effect has, wisely, not been distributed.
The Army oversaw while Kligman continued to test out skin-burning chemicals to (in their words) "learn how the skin protects itself against chronic assault from toxic chemicals, the so-called hardening process" and test out many products whose effects were unknown at the time, but with the intent of figuring that out.

While the Nuremberg trials were being conducted and the ethics and rights of humanity were under investigation, the U.S. was secretly taking in Nazi scientists and giving them American identities Under Operation Paperclip, named so because of the paperclips used to attach the scientists' new profiles to their US personnel pages, N***s who had worked for in the infamous human experiments (which included surgically grafting twins to each other and making then conjoined, removing nerves from people's bodies without anesthetic, and testing explosion-effects on them) in Germany brought over their talents to work on a number of top secret projects for the US.Given then-President Truman’s anti-Nazi orders, the project was kept under wraps and the scientists received faked political biographies, allowing these monsters to live on not only American soil, but as free men.

In 1931, Dr. Cornelius (that’s right, Cornelius) Rhoads was sponsored by the Rockefeller Institute to conduct experiments in Puerto Rico. He infected Puerto Rican citizens with cancer cells, presumably to study the effects. Thirteen of them died.What’s most striking is that the accusations stem from a note he allegedly wrote:
The Porto Ricans (sic) are the dirtiest, laziest, most degenerate and thievish race of men ever to inhabit this sphere... I have done my best to further the process of extermination by killing off eight and transplanting cancer into several more... All physicians take delight in the abuse and torture of the unfortunate subjects."
A man that seems to be hell-bent on killing Puerto Rico through a cancer infestation would not seem a suitable candidate to be elected by the US to be in charge of chemical warfare projects and receive a seat on the United States Atomic Energy Commission, right?But that’s exactly what happened. He also became vice-president of the American Cancer Society.

In the 60’s, the Department of Defense performed a series of irradiation experiments on non-consenting, poor, African-American cancer patients. They were told they would be receiving treatment, but they weren’t told it would be the "Pentagon" type of treatment: meaning to study the effects of high level radiation on the human body To avoid litigation, forms were signed only with initials so that the patients would have no way to get back at the government In a similar case, Dr. Eugene Saenger, funded by the Defense Atomic Support Agency (fancy name), conducted the same procedure on the same type of patients. The poor, black Americans received about the same level of radiation as 7500 x-rays to their chest would, which caused intense pain, vomiting and bleeding from their nose and ears. At least 20 of the subjects died

Here's a government experiment that, when you Google it, has completely different image results than web results. But in order to lure the individuals there, the CIA made these safe houses out to be, wait for it, Brothels.Prostitutes on the CIA payroll (yes, there was such a thing) lured "clients" back the houses.
Instead of having sex with them, though, they dosed them with a number of substances, most famously '___'. This also involved extensive use of marijuana. The experiments were monitored behind a two-way mirror, kind of like a sick, twisted peep show. Furthermore, it's alleged that the officials who ran the experiments described them as..." it was fun, fun, fun. Where else could a red-blooded American boy lie, kill, cheat, steal, rape and pillage with the sanction and bidding of the All-highest?"
The most horrifying part was the idea of dosing non-consenting adults with drugs they couldn't possibly know the effects of

After unleashing hell upon Hiroshima and Nagasaki, the United States embarked on numerous thermonuclear bomb tests in the Pacific in response to increased Soviet bomb activity. They were intended to be a secret affair. However, this secrecy would fail. Detonated in 1954 over Bikini Atoll in the Marshall Islands, Castle Bravo was the most powerful nuclear device the US ever set off. What they didn't expect was for the fallout from the blast to inadvertently be blown upwind onto nearby residents of other islands. The suffering included birth defects and radiation sickness. The effects were greater felt in later years when many children whose parents were exposed to the fallout developed thyroid cancer and neoplasms.This created Project 4.1, a study to examine the effects of radiation fallout on human beings. Essentially,it was the latest in a long string of studies where humans act as guinea pigs without giving consent and a project remembered by the US as a way to gather data that would otherwise be unobtainable. The US moral standard that history best remembers is that even though the radiation fallout on the people of the Marshall Islands was an accident, it might as well have been intended.

The recent uncovering of the US exposing Guatemalans to syphilis brings back to mind this infamous study. In between 1932 and 1972, researchers recruited 400 black share-croppers in Tuskegee, Alabama to study the natural progression of syphilis.But the scientists never told the men they had syphilis. Instead, they went around believing that they were being treated for "bad blood" disease as researchers used them to find out the extent of syphilis symptoms and effects.In 1947, penicillin became the standard cure for syphilis. But along with withholding information about the disease, scientists also "forgot" to tell their subjects that what they were being treated for had a cure. And so the study continued for nearly 30 years more.