Margaret Sanger’s ties to the organized eugenics movement were not limited to her work with the American Eugenics Society (see my other post).
Sanger and her birth control clinic’s main doctor, Dr. Hannah Stone, wrote several times on eugenic topics for Eugenics, the journal of the American Eugenics Society. See, for example, “Symposium on Genius and Birth Control, ” featuring both Stone and Sanger, vol. 2, no. 3 (March 1929), pp. 22-24; and Stone, “The Birth Control Clinic of Today and Tomorrow,” vol.2, no. 5 (May 1929), pp. 9-11.
The AES testified for birth control bills which Sanger's National Committee on Federal Legislation for Birth Control (NCFLBC, a forerunner of Planned Parenthood) supported, and they pledged their complete support of her efforts (Ibid., AES Board Meeting minutes, 1/9/35).
Sanger friend and colleague Dorothy Brush was on the board of the Brush Foundation, specifically founded for the purpose of pursuing eugenic goals: see Dorothy Brush, “The Brush Foundation (Eugenical Institutions 5)," Eugenics, vol. 2, no. 2 [Feb. 1929], pp. 17-19. The Brush Foundation funded Sanger and her groups often, and it provided the start-up money for the International Planned Parenthood Federation (Ellen Chesler, Woman of Valor: Margaret Sanger and the Birth Control Movement in America [NY: Simon and Schuster, 1992], p. 410).