In "Sex Slaves," FRONTLINE follows Viorel on an extraordinary journey deep into the world of sex trafficking to try to find his wife, Katia, who was four months' pregnant when she left home, and then free her from the violent pimp who now "owns" her.Along the way, the production team takes a rare, hidden-camera look at the various traffickers, pimps and middlemen who illegally buy and sell hundreds of thousands of women each year. Lured by traffickers who prey on their dreams of employment abroad, many of the women are then kidnapped and "exported" to Europe, the Middle East, the United States and elsewhere. During this process, they may be sold to pimps, locked in brothels, drugged, terrorized and raped repeatedly. In Eastern Europe, since the fall of communism, sex trafficking has become the fastest growing form of organized crime, with Moldova and Ukraine widely seen as major suppliers of women into the global sex trade.