The surgeon who sterilized the men said that it was necessary to "keep from contaminating the general population with radiation-induced mutants".

http://en.wikipedia.org/wiki/Human_expe ... ted_States

There have been numerous human experiments performed in the United States that have been considered unethical, and were often performed illegally, without the knowledge, consent, or informed consent of the test subjects.

Many types of experiments were performed including the deliberate infection of people with deadly or debilitating diseases, exposure of people to biological and chemical weapons, human radiation experiments, injection of people with toxic and radioactive chemicals, surgical experiments, interrogation/torture experiments, tests involving mind-altering substances, and a wide variety of others. Many of these tests were performed on children and mentally disabled individuals. In many of the studies, a large portion of the subjects were poor racial minorities or prisoners. Often, subjects were sick or disabled people, whose doctors told them that they were receiving "medical treatment", but instead were used as the subjects of harmful and deadly experiments, without their knowledge or consent.

...as of 2007, not a single U.S. government researcher had been prosecuted for human experimentation, and many of the victims of U.S. government experiments have not received compensation, or in many cases, even acknowledgment of what was done to them.