Margaret Sanger started the Birth Control League in 1914 in New York. After WWII, it became the Planned Parenthood federation. Below, I have linked to a newspaper story I posted from 1950. The last line is:
Mrs. Sanger said that the federation should "stress quality as a prime essential in the birth and survival of our population."
That means exactly what it sounds like. She intended birth control and abortion to be used to improve the "quality" of the human race.
http://www.freerepublic.com/focus/news/991823/posts?page=65#65
Yes, exactly. She was very concerned about the way that "undesirables" tended to reproduce in greater numbers than the "more refined" specimens, though some of that was not factual and was the usual racist bilge portraying Blacks and non-Nordic Europeans as sex-crazy. That's why she located her first clinics in minority neighborhoods, claiming she was there to help poor women control their bodies, but really just working hard to keep their birth-rate low. The BCL also sent Black preachers through the South to preach the birth-control doctrine, and idea Sanger came up with personally.