— Margaret Sanger American birth control activist, educator and nurse 1879 - 1966
Unknown source. Often falsely cited as Birth Control Review, April 1933 http://lifedynamics.com/app/uploads/2015/09/1933-04-April.pdf, as in William D. Gairdner, The War Against the Family (1992), p. 464 https://books.google.com/books?id=vZsQ5d_43zEC&pg=PA464. No letters or articles by Sanger appear in that issue.
John George, in American Extremists: Militias, Supremacists, Klansmen, Communists & Others (1992), p. 415, describes this quote as "evidently concocted in the late 1980s".