Francis Galton:
I do not see why any insolence of caste should prevent the gifted class, when they had the power, from treating their compatriots with all kindness, so long as those with inferior genes maintained celibacy. But if these continue to procreate children, inferior in moral, intellectual and physical qualities, it is easy to believe that the time may come when such persons would be considered as enemies to the State, and to have forfeited all claims to kindness.-Hereditary Genius: An Inquiry into Its Laws and Consequences