Sanger was a racist eugenics who supported abortion to weed out the 'poor and unfit.' Also, she was affiliated with the KKK (admits it herself). She said that on page 366, for those wondering.
“The most merciful thing that a large family does to one of its infant members is to kill it." Margaret Sanger”
― Margaret Sanger, Woman and the New Race
Really tells a lot about this person.