Somaly’s shelters — where the youngest girl rescued is 4 years old — provide an education and job skills. More important, Somaly applies public and international pressure to push the police to crack down on the worst brothels, and takes brothel owners to court. The idea is to undermine the sex-trafficking business model.

In her book, Somaly recounts how she grew up as an orphan and was “adopted” by a man who sold her to a brothel. Once when Somaly ran away, the police gang-raped her. Then her owner, on recovering his “property,” not only beat and humiliated her but tied her down naked and poured live maggots over her skin and in her mouth.

Yet even after that, Somaly occasionally defied him. Once two new girls, about 14 years old, were brought in to the brothel and left tied up. Somaly untied them and let them run away. For that, she was tortured with electric shocks.

As Cambodia opened up, Somaly began to get foreign clients, whom she vastly preferred because they didn’t beat her as well, and she began learning foreign languages. Eventually, a French aid worker named Pierre Legros and she got married, and together they started Afesip, a small organization to fight sex trafficking. They have since divorced, and Somaly works primarily through the Somaly Mam Foundation, set up by admiring Americans to finance her battle against trafficking in Cambodia. It’s a successful collaboration between American do-gooders with money and a Cambodian do-gooder with local street smarts.

The world’s worst trafficking is in Asia, but teenage runaways in the United States are also routinely brutalized by their pimps. If a white, middle-class blonde goes missing, the authorities issue an Amber Alert and cable TV goes berserk, but neither federal nor local authorities do nearly enough to go after pimps who savagely abuse troubled girls who don’t fit the “missing blonde” narrative. The system is broken.

A bill to strengthen federal anti-trafficking efforts within the U.S. was overwhelmingly passed by the House of Representatives, led by Carolyn Maloney, Democrat of New York. But crucial provisions to crack down on pimping are being blocked in the Senate in part by Senators Sam Brownback and Joe Biden, who consider the House provisions unnecessary and problematic. (Barack Obama gets it and says the right things about trafficking to the public, but apparently not to his running mate.)

With U.N. leaders this week focused on overcoming poverty, Somaly is a reminder that we needn’t acquiesce in the enslavement of girls, in this country or abroad. If we defeated slavery in the 19th century, we can beat it in the 21st century.