I'm not going to do the Google searching for you guys. She was a huge supporter of eugenics (for those who can't be bothered to do your own searching):

So, Planned Parenthood started with Margaret Sanger…The woman who believed that black people were inferior and should be eradicated, thus creating a way to do so by killing the unborn before they could "pollute" the gene pool. Wow… So Planned Parenthood was created to kill off black people. Great job, you guys.