It took a bloody Civil War and the passage of a Constitutional amendment to eliminate slavery in the United States. Today, the tools to combat slavery have become decidedly more high-tech (and nonviolent). Made in a Free World in San Francisco, for example, has developed software that helps companies determine whether products they sell or make depend on global slave labor. At least 20 million people across the world are being forced to work for no pay. These workers are either directly or indirectly producing the goods sold by major corporations and small businesses alike, including those in the United States. At the level of global brands, forced labor and human trafficking can often be hidden from view, the result of complex and frequently outsourced recruitment and hiring practices," according to a United Nations report. Made in a Free World is a nonprofit that grew out of work that founder and CEO Justin Dillon did for the State Department in 2011. Dillon helped create an algorithm that allows consumers to determine the probability that companies were using slave labor, especially in raw material production, to make 400 popular products like beds, cars and cell phones. "We wanted to start a conversation," Dillon told me. "No one wants to go out and buy things from slavery." But Dillon realized that consumers were just one half the equation. To create real change, Made in a Free World needed to help companies - not just shame them - to rid slave labor from supply chains.