SANTA ANA — They call themselves "pornbusters."

Sarah Sansevieri raids Newport Beach liquor stores and magazine stands armed with a Polaroid camera and a California Penal Code handbook. She asks shop owners to make adult magazines less visible so children won't be exposed to them when buying a candy bar.

Marjie Garcia rallies behind residents against adult-oriented businesses from Garden Grove, her home city, to Lake Forest. Ginny Lukei of Santa Ana gives lectures to parents about the dangers of pornography addiction at high schools and colleges. Monique Nelson is regularly called on to speak on radio and television talk shows to argue that there is a link between illegal pornography and criminal acts.

Together, they are the core of the West Coast branch of Enough Is Enough!, a national, nonprofit organization based in Santa Ana that attempts to raise public awareness about the effects of pornography on society.

"We are not after Playboy and Penthouse. We are against child pornography and hard-core smut--the illegal stuff," said Nelson, 52, the West Coast director. "We go and teach people about 'porn-busting.' "

Defenders of sexually explicit material say claims by groups such as Enough is Enough! often reach too far and defy constitutional protections of free expression.

"Because the definition of pornography is different for everyone," said Jeffrey J. Douglas, a Santa Monica criminal defense attorney and chair of the National Free Speech Coalition, "there's a fine line between what is offensive to one person and what isn't."

Douglas, who is spokesman for the National Trade Assn. for the Adult Entertainment Industry, said there are social costs in eliminating pornography.

"We have this cultural conflict because sex is not discussed in public. It is a private matter," he said. "But there is this drive for voyeurism and exhibitionism that is fueled by this constraint."

Members of Enough is Enough! see it differently.

The organization, which has about 300 volunteers--mostly women--started as an awareness campaign three years ago after a group of women activists from across the country gathered in Washington for a conference on how to fight pornography.

As a result, Nelson and friends Sarah Blanken and Dee Jepsen formed Enough is Enough!. Blanken and Jepsen are based in Virginia. Nelson came back to her home in Santa Ana to organize the West Coast campaign.