Attorney General's Annual Report to Congress and Assessment of U.S. Government Activities to Combat Trafficking in Persons: Fiscal Year 2011 [open pdf - 3MB]
From the Introduction: "Trafficking in persons (TIP), or human trafficking, is a widespread form of modern-day slavery. Traffickers target all vulnerable populations, around the world and right next door: women and men, adults and children, citizens and non-citizens, English speakers and non-English speakers, and people from all socioeconomic groups. Victims are often lured by traffickers with false promises of good jobs and better lives, and then forced to work under brutal and inhumane conditions. Due to the hidden nature of the crime--trafficking victims may work in the open, but the coercion that ensnares them may be more subtle--it is difficult to accurately estimate the extent of victimization. Nonetheless, the United States (U.S.) has led the world in the campaign against this terrible crime both at home and overseas."
U.S. Department of Justice: http://www.justice.gov/