The Fundamentalist Church of Jesus Christ of Latter Day Saints is a polygamous splinter group of the Mormon church based in Colorado City, Ariz. Their leader is Warren Jeffs, who continues to lead the church from prison, where he serves a life sentence for sexually assaulting children. Miryam Holm, a nurse, tends a family at the Hildale Maternity Clinic.

Fundamentalist Church of Jesus Christ of Latter Day Saints (FLDS) children in a swimming hole in Colorado City, Ariz. FLDS women cover up from neck to ankle, because their bodies are considered sacred temples. They never cut their hair. According to their teachings, they will need it in heaven to wash men's feet as an anointing.

Women make textbooks at the FLDS publishing house in Colorado City, Ariz. A portrait of Warren Jeffs looks down on them. A former FLDS member said schools teach that Jeffs is President of the United States -- his face is on every child's school notebook -- and that man never landed on the moon because God guided Neil Armstrong away from it.

FLDS member Richard Jessop teaches his children how to play football. Elissa Wall has written a book about her escape from the sect. When she was 14, Warren Jeffs forced her to marry her first cousin. "Men were in charge of us," Wall said. "They were the only way we were going to get to Heaven. We had to love them no matter what. ... We had to share them with other women. ... We had to submit."

Joe Jessop's family harvesting cane. FLDS members cultivate their own crops to be self-sufficient in living apart from the outside world. Colorado City is a desert town on the border of Arizona and Utah.

Young women tending babies at the Hildale Maternity Clinic in Colorado City, Ariz. All women in FLDS share the same goal: having as many children as possible, and living with "plural" wives.

Joy Nielsen holding her baby at Hildale Maternity Clinic. WATCH THE FULL STORY ON "20/20: BREAKING POLYGAMY" TONIGHT AT 10 ET.