When I arrived at Camp Ashraf, the base of the group’s operations, in April 2003, I thought I’d entered a fictional world of female worker bees. Everywhere I saw women dressed exactly alike, in khaki uniforms and mud-colored head scarves, driving back and forth in white pickup trucks, staring ahead in a daze as if they were working at a factory in Maoist China. I met dozens of young women buried in the mouths of tanks, busily tinkering with the engines. One by one, the girls bounded up to me and my two minders to recite their transformations from human beings to acolytes of Ms. Rajavi. One said she had been suicidal in Iran until she found Ms. Rajavi on the Internet.

At Camp Ashraf, 40 miles north of Baghdad, near the Iranian border, 3,400 members of the militant group reside in total isolation on a 14-square-mile tract of harsh desert land. Access to the Internet, phones and information about the outside world is prohibited. Posters of Ms. Rajavi and her smiling green eyes abound. Meanwhile, she lives in luxury in France; her husband has remained in hiding since the United States occupied Iraq in 2003.

During the Iran-Iraq war in the 1980s, the group served as Mr. Hussein’s own private militia opposing the theocratic government in Tehran. For two decades, he gave the group money, weapons, jeeps and military bases along the border with Iran. In return, the Rajavis pledged their fealty.

In 1991, when Mr. Hussein crushed a Shiite uprising in the south and attempted to carry out a genocide against the Kurds in the north, the Rajavis and their army joined his forces in mowing down fleeing Kurds.

Ms. Rajavi told her disciples, “Take the Kurds under your tanks, and save your bullets for the Iranian Revolutionary Guards.” Many followers escaped in disgust.

So the Rajavis then began preying on Iranian refugees and asylum seekers in Europe to fill their ranks. The Rajavis promise them salaries, marriage, family, freedom and a great cause — fighting the Iranian government. Then the unwitting youths arrive in Iraq.

What is most disturbing is how the group treats its members. After the Iran-Iraq war, Mr. Rajavi orchestrated an ill-planned offensive, deploying thousands of young men and women into Iran on a mass martyrdom operation. Instead of capturing Iran, as they believed they would, thousands of them were slaughtered, including parents, husbands and wives of those I met in Iraq in 2003.