Researchers at the University of California, San Francisco conducted dozens of unethical medical experiments including injecting pesticides and herbicides into men’s veins.
His Wikipedia page says that they were not just prisoners but "mentally disabled" prisoners:
He has written over 3,000 research articles, which according to an estimate could be a world record. He was, however, found to have conducted research on mentally disabled prisoners without record of their consent. He and other researchers exposed a number of mentally disabled prisoners to herbicides and insecticides. Maibach claims he followed what was considered to be ethical at the time.
His Wikipedia page says that they were not just prisoners but "mentally disabled" prisoners:
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