The men in Tuskegee weren't infected with Syphilis by the government.
This is just some of what Mengele did- much of it to small children- and it wasn't solely Jews, Romany too.
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Experiments performed by Mengele on twins included unnecessary amputation of limbs, intentionally infecting one twin with typhus or other diseases, and transfusing the blood of one twin into the other. Many of the victims died while undergoing these procedures.[50] After an experiment was over, the twins were sometimes killed and their bodies dissected.[51] Nyiszli recalled one occasion where Mengele personally killed fourteen twins in one night via a chloroform injection to the heart.[34] If one twin died of disease, Mengele killed the other so that comparative post-mortem reports could be prepared.[52]
Mengele's experiments with eyes included attempts to change eye color by injecting chemicals into the eyes of living subjects and killing people with heterochromatic eyes so that the eyes could be removed and sent to Berlin for study.[53] His experiments on dwarfs and people with physical abnormalities included taking physical measurements, drawing blood, extracting healthy teeth, and treatment with unnecessary drugs and X-rays.[3] Many of the victims were sent to the gas chambers after about two weeks, and their skeletons were sent to Berlin for further study.[54] Mengele sought out pregnant women, on whom he would perform experiments before sending them to the gas chambers.[55] Witness Vera Alexander described how he sewed two Romani twins together back to back in an attempt to create conjoined twins.[50] The children died of gangrene after several days of suffering.[56]
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http://en.wikipedia.org/wiki/Josef_Mengele#Human_experimentation
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