"Attila the Nun" on Leaving the Convent and Joining the Courtroom.

Sister Mary Scullion. She's worked with the homeless and the mentally ill for 16 years, as an advocate and a co-founder of: Women of Hope, a permanent residence and support services center for homeless mentally ill women; the Outreach Coordination Center, which coordinated the services of private and public agencies working with chronically homeless persons; and Project H.O.M.E. which provides residential and rehabilitative services to the chronically homeless. Sister Mary was honored for her efforts with the 1992 Philadelphia Award.

When Armstrong decided to leave the Roman Catholic convent where she was a nun in 1969, she entered a world vastly different than the one she had been isolated from for seven years. She had no idea what was going on in Vietnam and had little idea what was happening in popular culture. She's written a new memoir, The Spiral Staircase: My Climb Out of Darkness, about her life in the convent and the spiritual quest that followed. Her other books include The Battle for God and A History of God.

Former Sisters of Notre Dame Barbara Ferraro and Patricia Hussey were once known as the "abortion nuns." In 1984, they signed a New York Times ad that called on the Catholic Church to reconsider its stance on abortion. Their new book, No Turning Back, also outlines their differences with Church teachings on divorce and the ordination of women.