Margaret Sanger believes the greatest sin in the world is to give birth to a child that is ‘marked when they are born”. There is a 24 second video on this site http://www.toomanyaborted.com/?page_id=592 Also on this page are PDF files of Sangers own words that you can download and read
Also she spoke to the KKK http://margaretsanger.blogspot.com/2006/10/contest-marks-80th-anniversary-of.html
Here is an interview she had with Mike Wallace, not sure of the date. It is in 3 parts on Youtube.com
Part 1: http://www.youtube.com/watch?v=in7IUzjN3pY
Part 2: http://www.youtube.com/watch?v=S3U3NcCD1lg&feature=related
Part 3: http://www.youtube.com/watch?v=nZdwpjArFjg&feature=related (around 2:40 is where she makes the “greatest sin in the world” statement about children)
http://www.youtube.com/watch?v=dYbUcpV36Ag Glenn Beck interviewing Angela Franks author of Margaret Sanger’s Eugenics Legacy.