U.S. Sen. Susan Collins has sent letters to the heads of the U.S. Department of Labor and the Citizenship and Immigration Service, asking what their agencies have done to address problems in foreign-labor programs that were detailed in a recent Portland Press Herald/Maine Sunday Telegram investigation. Collins wrote in her capacity as chairwoman of the Senate's Committee on Homeland Security and Governmental Affairs. It's the first official call for answers from federal authorities since the newspaper's series ran in late September. The three-part series detailed concerns about the H1B visa program and the permanent green-card system. H1B visas let skilled...