A record 172,000 migrants were apprehended at the southern border in March. Those numbers are fueled, in part, by smuggling organizations that exploit desperate migrants, most of them from central America. NPR's John Burnett and KTEP's Angela Kocherga report on their tactics.Department of Homeland Security Secretary Alejandro Mayorkas tells NPR about a new multi-agency effort to crack down on smugglers. In participating regions, you'll also hear from local journalists about what's happening in your community.Email us at considerthis@npr.org.