Share Published: June, 2014 By: National Human Trafficking Resource Center (NHTRC) Watch this online training to learn how gangs are trafficking women and girls for sex. More on Sex Trafficking » Estimating the Size and Structure of the Underground Commercial Sex Economy in Eight Major Cities American Indian Adolescent Girls: Vulnerability to Sex Trafficking, Intervention Strategies More on Getting Started Human Trafficking 101 National Human Trafficking Hotline At a Glance More on Law Enforcement Understanding Victim Mindsets Fake Massage Businesses At a Glance More on Legal Professionals Creating and Sustaining a Local Response to Human Trafficking: Compendium of Promising Practices (FYs 2008 - 2011) Understanding Victim Mindsets More on Online Trainings Human Trafficking 101 Human Trafficking Awareness for Mental Health Professionals