In Chisinau, the capital of the former Soviet republic of Moldova-the poorest country in Europe and the one experts say is most heavily culled by traffickers for young women-I saw a billboard with a fresh-faced, smiling young woman beckoning girls to waitress positions in Paris. But of course there are no waitress positions and no "Paris." Some of these young women are actually tricked into paying their own travel expenses-typically around $3,000-as a down payment on what they expect to be bright, prosperous futures, only to find themselves kept prisoner in Mexico before being moved to the United States and sold into sexual bondage there.

The Eastern European trafficking operations, from entrapment to transport, tend to be well-oiled monoethnic machines. One notorious Ukrainian ring, which has since been broken up, was run by Tetyana Komisaruk and Serge Mezheritsky. One of their last transactions, according to Daniel Saunders, an assistant U.S. attorney in Los Angeles, took place in late June 2000 at the Hard Rock Cafe in Tijuana. Around dinnertime, a buyer named Gordey Vinitsky walked in. He was followed shortly after by Komisaruk's husband, Valery, who led Vinitsky out to the parking lot and to a waiting van. Inside the van were six Ukrainian women in their late teens and early twenties. They had been promised jobs as models and babysitters in the glamorous United States, and they probably had no idea why they were sitting in a van in a backwater like Tijuana in the early evening. Vinitsky pointed into the van at two of the women and said he'd take them for $10,000 each. Valery drove the young women to a gated villa twenty minutes away in Rosarito, a Mexican honky-tonk tourist trap in Baja California. They were kept there until July 4, when they were delivered to San Diego by boat and distributed to their buyers, including Vinitsky, who claimed his two "purchases." The Komisaruks, Mezheritsky, and Vinitsky were caught in May 2001 and are serving long sentences in U.S. federal prison.

In October, I met Nicole, a young Russian woman who had been trafficked into Mexico by a different network. "I wanted to get out of Moscow, and they told me the Mexican border was like a freeway," said Nicole, who is now twenty-five. We were sitting at a cafe on the Sunset Strip in Los Angeles, and she was telling me the story of her narrow escape from sex slavery-she was taken by immigration officers when her traffickers were trying to smuggle her over the border from Tijuana. She still seemed fearful of being discovered by the trafficking ring and didn't want even her initials to appear in print. (Nicole is a name she adopted after coming to the United States.)

Two years ago, afraid for her life after her boyfriend was gunned down in Moscow in an organized-crime-related shootout, she found herself across a cafe table in Moscow from a man named Alex, who explained how he could save her by smuggling her into the United States. Once she agreed, Nicole said, Alex told her that if she didn't show up at the airport, " 'I'll find you and cut your head off.' Russians do not play around. In Moscow you can get a bullet in your head just for fun."

Donna M. Hughes, a professor of women's studies at the University of Rhode Island and an expert on sex trafficking, says that prostitution barely existed twelve years ago in the Soviet Union. "It was suppressed by political structures. All the women had jobs." But in the first years after the collapse of Soviet Communism, poverty in the former Soviet states soared. Young women-many of them college-educated and married-became easy believers in Hollywood-generated images of swaying palm trees in Los Angeles. "A few of them have an idea that prostitution might be involved," Hughes says. "But their idea of prostitution is Pretty Woman, which is one of the most popular films in Ukraine and Russia. They're thinking, This may not be so bad."

The girls' first contacts are usually with what appear to be legitimate travel agencies. According to prosecutors, the Komisaruk/ Mezheritsky ring in Ukraine worked with two such agencies in Kiev, Art Life International and Svit Tours. The helpful agents at Svit and Art Life explained to the girls that the best way to get into the United States was through Mexico, which they portrayed as a short walk or boat ride from the American dream. Oblivious and full of hope, the girls get on planes to Europe and then on to Mexico.

Every day, flights from Paris, London, and Amsterdam arrive at Mexico City's international airport carrying groups of these girls, sometimes as many as seven at a time, according to two Mexico City immigration officers I spoke with (and who asked to remain anonymous). One of them told me that officials at the airport- who cooperate with Mexico's federal preventive police (PFP)- work with the traffickers and "direct airlines to park at certain gates. Officials go to the aircraft. They know the seat numbers. While passengers come off, they take the girls to an office, where officials will 'process' them."

Magdalena Carral, Mexico's commissioner of the National Institute of Migration, the government agency that controls migration issues at all airports, seaports, and land entries into Mexico, told me: "Everything happens at the airport. We are giving a big fight to have better control of the airport. Corruption does not leave tracks, and sometimes we cannot track it. Six months ago we changed the three main officials at the airport. But it's a daily fight. These networks are very powerful and dangerous."

But Mexico is not merely a way station en route to the United States for third-country traffickers, like the Eastern European rings. It is also a vast source of even younger and more cheaply acquired girls for sexual servitude in the United States. While European traffickers tend to dupe their victims into boarding one-way flights to Mexico to their own captivity, Mexican traffickers rely on the charm and brute force of "Los Lenones," tightly organized associations of pimps, according to Roberto Caballero, an officer with the PFP. Although hundreds of "popcorn traffickers"-individuals who take control of one or two girls-work the margins, Caballero said, at least fifteen major trafficking organizations and one hundred and twenty associated factions tracked by the PFP operate as wholesalers: collecting human merchandise and taking orders from safe houses and brothels in the major sex-trafficking hubs in New York, Los Angeles, Atlanta, and Chicago.

Like the Sicilian Mafia, Los Lenones are based on family hierarchies, Caballero explained. The father controls the organization and the money, while the sons and their male cousins hunt, kidnap, and entrap victims. The boys leave school at twelve and are given one or two girls their age to rape and pimp out to begin their training, which emphasizes the arts of kidnapping and seduction.

Throughout the rural and suburban towns from southern Mexico to the United States border, along what traffickers call the Via Lactea, or Milky Way, the agents of Los Lenones troll the bus stations and factories and school dances where under-age girls gather, work, and socialize. They first ply the girls like prospective lovers, buying them meals and desserts, promising affection and then marriage. Then the men describe rumors they've heard about America, about the promise of jobs and schools. Sometimes the girls are easy prey. Most of them already dream of El Norte. But the theater often ends as soon as the agent has the girl alone, when he beats her, drugs her, or simply forces her into a waiting car.

The majority of Los Lenones-80 percent of them, Caballero says-are based in Tenancingo, a charmless suburb an hour's drive south of Mexico City. Before I left Mexico City for Tenancingo in October, I was warned by Mexican and United States officials that the traffickers there are protected by the local police, and that the town is designed to discourage outsiders, with mazelike streets and only two closely watched entrances. The last time the federal police went there to investigate the disappearance of a local girl, their vehicle was surrounded, and the officers were intimidated into leaving. I traveled in a bulletproof Suburban with well-armed federales and an Immigration and Customs Enforcement agent.