"We do not want word to go out that we want to exterminate the Negro population," she said, "if it ever occurs to any of their more rebellious members." Woman's Body, Woman's Right: A Social History of Birth Control in America, by Linda Gordon

In an interview with Mike Wallace in 1957, Sanger said, “I think the greatest sin in the world is bringing children into the world, that have disease from their parents, that have no chance in the world to be a human being practically.”

“Delinquents, prisoners, all sorts of things just marked when they’re born. That to me is the greatest sin—that people can—can commit,” she said.  

On blacks, immigrants and indigents:
"...human weeds,' 'reckless breeders,' 'spawning... human beings who never should have been born."  Margaret Sanger, Pivot of Civilization, referring to immigrants and poor people.

The purpose in promoting birth control was "to create a race of thoroughbreds," she wrote in the Birth Control Review, Nov. 1921 (p. 2)