WASHINGTON, Dec. 6—Speaking at the Conference on Trafficking in Persons in North America, U.S. Secretary of Labor Elaine L. Chao outlined the international scope of human trafficking and the Department's efforts to combat it. "The evil of trafficking in human beings must be stopped," Chao said. "The worldwide incidence of men, women and children being enslaved demands a vigorous and sustained international effort to rescue victims and protect future generations."