G. K. Chesterton 
Eugenics and Other Evils 

When he wrote this book, Chesterton stood virtually alone against the intellectual world of his day. Yet to his eternal credit, he showed no sign of being intimidated by the prestige of his foes. On the contrary, he thunders against eugenics, ranking it one of the great evils of modern society. And, in perhaps one of the most chillingly accurate prophecies of the century, he warns that the ideas that eugenics had unleashed were likely to bear bitter fruit in another nation. That nation was Germany, the "very land of scientific culture from which the ideal of a Superman had come." In fact, the very group that Nazism tried to exterminate, Eastern European Jews, and the group it targeted for later extermination, the Slavs, were two of those whose biological unfitness eugenists sought so eagerly to confirm. (Goodreads)