before returning to philadelphia. >> he became ultimately involved in one of the weirdest and darkest episodes in the abortion rights movement. >> bret: an episode that would ultimately become the subject of a u.s. senate hearing on human experimentation. the story begins in chicago where abortion was illegal. the women's group chartered a bus to drive 15 poor pregnant women in their second trimess terrorist attack to philadelphia wher to philadelphia. the television footage is lost. only news paper accounts survived. they report that gosnell was using something called a supercoil. >> it was an experimental medical device meant to be inserted into the uterus of a woman who is pregnant and