One famous example is the Tuskegee syphilis study, which began in the nineteen thirties.
VOA: special.2010.07.21
Moreover, poor blacks harbour a strong mistrust of government doctors, mistrust that is partly a consequence of the notorious Tuskegeesyphilisstudy that ran between the 1930s and 1972.
The American Tradition Institute (ATI) which filed the law suit against EPA and its administrator asserts that such practices are not only illegal, but run afoul of virtually every rule of ethical standard established since World War II and the Tuskegeesyphilis experiments to protect human study subjects from rogue scientific research.
Clinton also included in his address Sunday a renewed pledge to carry out research at the highest standard of ethics to ensure there is never a repetition of a government study in Tuskegee, Alabama, on poor black men whose syphilis went untreated for years.