Tuskegee syphilis experiment - black men used as guinea pigs

Doctor "treating" syphilis patient (Public Domain - PD-USGOV)

“We must remember we are dealing with a group of people who are illiterate, have no conception of time, and whose personal history is always indefinite.”

---S.M. Reverby, Editor, Tuskegee’s Truths Rethinking the Tuskegee Syphilis Study, The University of North Carolina Press, Chapel Hill (2000), pp. 15–33.

For information on the whistleblower who stopped this experiment, go to:
http://www.whistleblower.org/blog/04302014-whistleblower-peter-buxtun-and-tuskegee-syphilis-study