Yeow, that's "WHO" PLANNED PARENTHOOD IS AND WHAT THEY STAND FOR...but they keep that information masked!!
No offense but that paragraph from Sanger is not only ellipsed(meaning context is not provided at all) but it seems like the kind of urban myth of ideological movements used to undermine the opposition but NOT through truth. This is commonly done with evolutionary theory in biology and so I'm wary of that quote you provided.