Luis Vega is on a mission to meet every man born in Madrid, Spain on Nov. 20, 1977. That's the day doctors told him that his baby son was stillborn, but he and his wife, Ines, believe their child was in fact stolen from the hospital.

“We have a son somewhere out there,” Luis Vega said.

The Vega family isn’t alone in believing their child was stolen. This year, more than a thousand families have come forward with claims that they were victims of baby trafficking committed by a variety of networks from the 1940s until as recently as the early 1990s.