Of the many global issues, human trafficking (or modern slavery, as it is sometimes called) is one of the toughest to combat. It’s estimated that more than 40 million people are trafficked across the world. “It’s probably the largest human rights travesty existing today,” says Karen Walkowski, founder of the Rotary Club of District 5950 Ending Human Trafficking. “It’s one of the three largest illegal industries, bringing in about $150 billion in revenue every year.” Read how the Rotary Action Group of Against Slavery and several cause-based clubs are fighting against this crisis.