MSTERDAM — Ayaan Hirsi Ali had done well in the 10 years since she arrived in the Netherlands as a young refugee from Somalia and, until a few months ago, she lived a quiet life in her adopted land. Never did she intend to create a national commotion.

She studied Dutch, took on cleaning jobs, went to university and worked as a political scientist. She made a name for herself pressing for the emancipation of Muslim women and documenting how thousands, living even here, were subjected to beatings, incest and emotional and sexual abuse.

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To the surprise of many, she became a leading voice condemning the government's support for multiculturalism, programs costing millions of dollars a year that she considers misplaced because they help keep Muslim women isolated from Dutch society.

Then Ms. Hirsi Ali, 32, began receiving hate mail, anonymous messages calling her a traitor to Islam and a slut. On several Web sites, other Muslims said she deserved to be knifed and shot. Explicit death threats by telephone soon followed. The police told her to change homes and the mayor of Amsterdam sent bodyguards. She tried living in hiding. Finally, last month, she became a refugee again, fleeing the Netherlands.

"I had to speak up," she said, in a telephone interview from her hiding place, "because most spokesmen for Muslims are men and they deny or belittle the enormous problems of Muslim women locked up in their Dutch homes."

Her ordeal has caused an outcry in the Netherlands, a country already uneasy with its recent waves of immigrants and asylum seekers, now representing almost 10 percent of the population. Many Dutch see the threats as an intolerable assault on the country's democratic principles. The threats have also intensified a fierce debate — one that can be heard these days across Europe — about what moral values and rules of behavior immigrants should be expected to share.

Though absent, Ms. Hirsi Ali seems very present here. Her portrait has appeared on magazine covers and television and there have been indignant newspaper editorials and questions in Parliament. Some have called her the Dutch Salman Rushdie. In paid advertisements, more than 100 Dutch writers have offered her support.

"I've made people so angry because I'm talking from the inside, from direct knowledge," she said. "It's seen as treason. I'm considered an apostate and that's worse than an atheist."

The theme of injustice toward women in Islamic countries has become common in the West, but it has gained fresh currency through Ms. Hirsi Ali's European perspective, her study of Dutch immigrants and her own life. Born in Mogadishu, she grew up a typical Muslim girl in Somalia. When she was 5, she underwent the "cruel ritual," as she called it, of genital cutting. When her father, a Somali opposition politician, had to flee the country's political troubles, the family went to Saudi Arabia, where, she said, she was kept veiled and, much of the time, indoors.

At 22, her father forced her to marry a distant cousin, a man she had never seen. But a friend helped her to escape and she finally obtained political asylum in the Netherlands.

She was shocked when, as a university student, she held a job as an interpreter for Dutch immigration and social workers and discovered hidden "suffering on a terrible scale" among Muslim women even in the Netherlands. She entered safe houses for women and girls, most of them Turkish and Moroccan immigrants, who had run away from domestic violence or forced marriages. Many had secret abortions.

"Sexual abuse in the family causes the most pain because the trust is violated on all levels," she said. "The father or the uncle say nothing, nor do the mother and the sisters. It happens regularly — the incest, the beatings, the abortions. Girls commit suicide. But no one says anything. And social workers are sworn to professional secrecy."

More than 100 women a year have surgery to "restore" their virginity, she estimates in her published work. While only 10 percent of the population is non-Dutch, this group accounts for more than 60 percent of abortions, "because the Muslim girls are kept ignorant," she said. Three out of five Moroccan-Dutch girls — Moroccans are among the largest immigrant groups — are forced to marry young men from villages back home, to keep them under control, she said.