from British Pathé YouTube collection

Margaret Sanger, the founder of Planned Parenthood, was an outspoken opponent of large families. In her 1922 book Woman and the New Race Sanger writes, "The most merciful thing that the large family does to one of its infant member is to kill it."
Saynsumthn's Blog, The Daily Caller and Life News  have reported on the discovery of a 1947 British Pathe "One Minute News" newsreel interview of Sanger (then known as Margaret Slee) in which she opposes childbirth in developing countries.

The YouTube description says, "Although this clip is cut short, Mrs. Slee's proposition was actually that there were no more babies in developing countries for the next ten years."
Newsreels were once popular in movie theaters before the emergence of television newscasts.
Other quotes from Sanger are available at WikiQuote.

more movie or what?

Then came one more summer break: after an editorial changeover at the magazine, I started writing on books, TV and movies for the thriving alternative weeklies (first The Real Paper in Cambridge, then The Boston Phoenix). In the summer of 1976, Joe Morgenstern, now the Pulitzer-prize-winning film critic for the Wall Street Journal, was in Boston with his then-wife, Piper Laurie, who was acting in a film about Margaret Sanger for PBS’ “Nova.” Unbeknownst to me, Joe started reading my stuff. When, nearly two years later, editor Jim Bellows offered him the movie critic slot at The Los Angeles Herald Examiner, Morgenstern didn’t want it himself – but he thought this guy he’d read in Boston just might. I flew to L.A. and I got the job.

source = baltimor blog