Watch National Geographic: Slave Girls of India (2007) : Full Movie Online Free Around the globe, over 200 million children are engaged in child labor, often, doing the most brutal or degrading of jobs. Girls are especially vulnerable. Even in countries as wealthy as the United States, girls face harsh lives as victims of sex trafficking or as migrant workers. Join National Geographic's Lisa Ling as we travel to India for a glimpse into the battle against child slavery.