She pulled tattered socks over her bony legs and stared at the ground, trying to hide the dirty, torn clothing she is so embarrassed to wear. Before a militia drove her African tribe off its farmland in western Sudan, before she had to wait in line for food rations in this refugee camp in the desert, Armani Tinjany was a high school agriculture teacher. Now she is a woman whose pride and energy are disintegrating.

Six months ago, when she first arrived in Chad, Tinjany, her sister and a group of friends sat and wrote indignant letters to U.S., British and Chadian officials. They asked for help in Darfur, the region of western Sudan where a conflict has displaced 1.5 million Africans and left nearly 50,000 dead, according to aid groups.

In an interview in February with The Washington Post, Tinjany said she had faith that she would return to Sudan, to the spacious compound of stone-walled huts where she lived at the edge of the Sahara desert, to her diet of fresh fruits and meat, to her job as a teacher.

Today, she has no hope. She writes no letters. She becomes sick easily. She has lost weight, and her skeletal shoulder pokes through her dress.

"I am a refugee now," she said, letting the words sink in. "Are they going to leave us like this forever? My life, as I knew it, is finished."

Standing in line for a ration of millet, she started to cry.

Violence began in Darfur about 18 months ago, when African groups rebelled against the government by attacking a military installation. The government responded by bombing areas of Darfur and by arming a marauding Arab militia called the Janjaweed, human rights and aid groups say.

Since then, the African residents of Darfur have been uprooted, beaten, raped and left hungry. But the educated among them -- teachers, students and community leaders -- say they are being particularly targeted. They have been singled out by the government, they say, accused of treason and support for the rebellion, and prevented from speaking out about the crisis.

Human rights investigators have called the assault on the educated an attempt to silence the residents of Darfur and a way to erase the community's collective memory and destroy its political strength.

"If you are a farmer, they will take your crops and kill you. If you are a woman, they will rape you. But if you are a teacher, then you have to run," said Sharif Ishag, who once taught geography and now helps run the camp's food distribution center for the International Rescue Committee. "They think anyone who can read and write and who can organize people and inspire minds are rebels."

Schools have been burned, desks broken and books shredded. In some areas, children have not been able to attend classes for nearly two years.

Olivier Bercault, a Human Rights Watch team member who spent three weeks touring Darfur, called the targeting of teachers and schools "a nasty way to stop a culture and prevent people from being educated."

"People are not able to send their child to school. They are now sitting in refugee camps," he said. "That lack of education, to me, is one of the purposes of ethnic cleansing. People keep debating if it's genocide -- we can leave that to the courts. But these are crimes against humanity."

Darfur residents and human rights investigators said there had long been a pattern of discrimination in the region's education system, as well as in employment and health care, with Arab Sudanese generally favored over their African countrymen. African tribal leaders have also been excluded from positions in the government and in civil society, they said.

"Africans have told me that if they were to call the police, no one would come if the accused were an Arab family," said Kelly D. Askin, a senior legal officer for the Open Society Justice Initiative, a group that is studying discrimination in the region. "If they were to try and send their child to school, an Arab family would get the slot first."

Amnesty International released a report Aug. 9 that said scores of people had been arrested since June in various parts of Darfur for speaking about atrocities to visiting foreign journalists and officials, including Secretary of State Colin L. Powell and members of an African Union commission.

Sudanese security forces arrested 15 men from the Abu Shouk refugee camp after Powell visited on June 30, according to the Amnesty report. Many of those detained have been students, teachers and community leaders, investigators said.

Buthayna Mohamed Ahmed, a teacher and a member of the Sudanese Women's Union, a professional organization, was arrested July 29 and detained in Nyala, a city in Darfur, apparently because she had advocated peace and the disarmament of the Janjaweed militia, the report said. In January, 10 students were arrested and beaten after holding a symposium on Darfur, according to the report.

"If you are in position of respect and power and you challenge what the security says, you become a risk," said Benedicte Gogeriaux, a researcher for Amnesty International. "For students and teachers and others, if you are viewed as someone who speaks out, you can be arrested, beaten or even worse."

At Oure Cassoni, a sand-swept camp in Chad, just across the border from Sudan, about 135 teachers live among the 17,000 refugees. Many of them said their Arab friends and co-workers had urged them to leave Darfur months ago.

"There are many teachers here because the schools were destroyed by the government," Abdul Jabar, a camp leader, said at a community meeting. "All the teachers and educated people were wanted by the government of Sudan."

Tinjany and other teachers who arrived in February spoke with The Washington Post in an open field in the nearby town of Bahai. The 30 women, all with university degrees, had suddenly been reduced to begging for dates and sorghum, shreds of clothing and bowls of water from Chad's already desperately poor population.

Tinjany said she eventually found work hand-washing laundry and used the money she earned to open a school for 100 Sudanese students. But at the end of July, the U.N. High Commissioner for Refugees, concerned that the coming rains would flood the camps, moved the refugees 17 miles northeast to a remote stretch of desert.

Hababa Saleh, 32, a primary school teacher, sat in Tinjany's tent recently with the other teachers, fiddling with a piece of straw. Hababa has four children, but she had to leave her 6-year-old daughter behind with an aunt when she fled the attacks in Darfur.

"I want to see my child," she said, folding her arms around her body and rocking gently. "We had such a good life. Sometimes I am sad. Sometimes I just feel angry."

Sitadour Ali, a preschool teacher with a round face, said she left her village when friends warned her about the rumors of attack.

"They told me to run," she said, looking down. "Sometimes I dream about my students. I dream of them every day."

Ali tries to be optimistic, she said, and has encouraged the teachers to open a school in the new camp. The teachers said they hoped that when the stream of arrivals to the camp slowed, the United Nations would help them start one.

"We would just need a few tents for schools, some papers and pens, a blackboard," Tinjany said.

They will teach math, science, reading and writing, she said -- and history. "The Sudanese children will want to know why they are living in Chad," Tinjany said.

Newly arriving refugees from Darfur, western Sudan, watch as a huge sandstorm nears the Oure Cassoni refugee camp outside Bahai in eastern Chad.Hababa Saleh, an elementary school teacher in her home village in Darfur, sits in her tent with her husband, also a teacher, and their daughter.Of the 17,000 Sudanese refugees living at the Oure Cassoni camp, about 135 had been teachers in Darfur.