I didn’t know much, if nothing at all about her. From what I just read.... Margaret Singer (who seems to be the creator of Planned Parenthood)....she definitely supported ‘negative eugenics’, but not abortion (necessarily).
Sanger’s family planning advocacy always focused on contraception, rather than abortion.[95][note 10] It was not until the mid 1960s, after Sanger’s death, that the reproductive rights movement expanded its scope to include abortion rights as well as contraception.[note 11] Sanger was opposed to abortions, both because they were dangerous for the mother, and because she believed that life should not be terminated after conception. In her book Woman and the New Race, she wrote, “while there are cases where even the law recognizes an abortion as justifiable if recommended by a physician, I assert that the hundreds of thousands of abortions performed in America each year are a disgrace to civilization.”
In other words, she didn’t like the actual taking of life but promoted some weird/racist view of eliminating the ‘weak’ through contraception. Seems the modern movement pivoted about their new views and Sanger’s.