"Despite the Skinner case, sterilization of people in institutions for the mentally ill and mentally retarded continued through the mid-1970's. At one time or another, 33 states had statutes under which more than 60,000 Americans endured involuntary sterilization. The Buck v. Bell precedent allowing sterilization of the so-called "feebleminded" has never been overruled."
http://www.eugenicsarchive.org/html/eugenics/essay8text.html