"We always bring baby shampoo. It helps wash out the pepper spray from your eyes," Zastrow said, referencing his many run-ins with the police and with clinic workers around the country.
Zastrow's children are homeschooled and as long as they can remember the Zastrows have spent their lives on the road, traveling around the country in their dusty, wine-colored Honda.
"I serve and volunteer with ministries," Zastrow said. "Sometimes, I have temp jobs as a consultant -- political campaigns, strategy PR, those kind of things."
Zastrow and fellow protestors said they weren't fazed by the federal judge's ruling to keep the clinic open, for now.
"It's not a setback for our mission, it's a setback for families and babies killed here every day," said Chet Gallagher, a former police officer who was fired 20 years ago for refusing to arrest anti-abortion rights protesters. He has been protesting full-time ever since.
"We don't verbally assault. We offer help and preach the gospel," said Zastrow, countering claims by Derzis and clinic staff that they "harass" women leaving the clinic after procedures.
But Derzis countered right back.
"When [patients] come out and you're screaming, 'How's it feel to have killed your baby?' Man, that's a bad person. There's nothing Christian about that," Derzis said.
Anti-abortion advocates who protest outside of the clinic argue that there is nothing safe about abortions, and say they are outraged that people like Parker won't concede the basic biological fact that if the fetus is left unimpeded, a baby will be born.
Their goal is to get women to reconsider the abortion, and when they are successful, one of the people they refer women to is Barbara Beaver, who runs a crisis pregnancy center on the other side of town.
Beaver offers counseling and support to women with unexpected pregnancies. The facility is stocked with baby food and clothes.
"So many of them say, 'Because it was legal, I thought it was right,'" Beaver said. "We have sanitized abortion. We can't go back to the coat-hanger days, so we don't call them coat hangers anymore. We call them cannulas. That cannula does the same thing to the baby that the coat hanger did. It's just sanitized."
Beaver believes all women will regret having an abortion in some part of themselves, but Derzis said that Beaver is "absolutely wrong," pointing out that an estimated one in three American women have had an abortion -- that according to a 2008 study by the non-profit Guttmacher Institute.
"My experience [is] that women who make this decision [do so] knowing full well they have choices," Derzis said.
But on the eve of a decision that will determine whether women can receive legal abortions in Mississippi, tensions, on both sides, flared. Find out what happened on "Nightline" TONIGHT at 12:35 a.m. ET.