Chances are, you've heard about this wretched woman any number of times before, but most likely, you've never heard her explain, as she does in this vintage 1957 television interview with Mike Wallace, why she did what she did and how she became, as Wallace inaptly termed it, a "crusader" for birth control and abortion. By the way, note that she is absolutely in error (intentionally or not, I can't say) when she claims that, when she was getting started on her contraception-abortion jihad, there was no oppsition from "the Church," by which she means the Catholic Church, "or any church." This is false. The Catholic Church had, just 27 years earlier reminded couples yet again that contraception is wrong and that the Church continured to firmly reject it (c.f., Pope Pius XI, Casti Connubii 53-62).
Watch the shadow cross her face and how she fidgets uncomfortably when Wallace asks her if it's true that her mother was born a Catholic and she admits it. The interview speaks for itself.
(Tangentially, and unrelated to Sanger's comments, a quick word about Mike Wallace's testimonial commercial for Philip Morris cigarettes — bizarre by today's sensibilities about smoking. Oddly, his clipped cadence, his facial expressions, such as the odd quick flashes of a phoney grin, here and there, reminded me less of the young Mike Wallace and more of Phil Hartman's SNL impression of Mike Wallace with a little 1976 Chevy Chase Weekend-Update thrown in around the edges.)