This article by Jonah Goldberg, at NRO, is chilling. Cold-shiver, hole-in-my-stomach chilling. And it's not something I haven't heard mentioned or implied before, but the names and quotes and details are sickening.
In the article, Goldberg talks about the connection between birth control, abortion, and ridding society of the "undesirable" segment of the population--the poor, the minorities, the criminally-inclined--eugenics, in other words, but the very use of the word "eugenics" seems to provide some sterilization from the horror of the ideas involved.
Go read it. It is good to be informed of such things. Be an informed citizen, though it sicken you.