Larry Lader, rightly dubbed the “father of the abortion rights movement,” influenced the women’s movement of the 1960s to push abortion. Lader was a writer by trade and became the biographer for Planned Parenthood founder Margaret Sanger, even referring to himself as her “disciple.” The two eventually parted ways over abortion. Watch to learn more:

In his biography, Lader said Sanger’s obsession with eugenics (an ideology the two shared) originated with her introduction to Henry Havelock Ellis in 1914, a psychologist and author of several books on sex, with whom Sanger was rumored to have had an affair. At the time Lader’s biography was published, it received some favorable reviews with Sanger herself arranging book signings. It was also reportedly distributed through Planned Parenthood offices.

But, in co-authoring his second book on Sanger, Lader can be credited for remaking her…