Former U.S. spy agency contractor Edward Snowden, who leaked details of massive U.S. intelligence-gathering programs, said in a U.S. TV interview he "was trained as a spy" and had worked undercover overseas for U.S. government agencies. In an advance excerpt of his interview in Moscow with "NBC Nightly News" that aired on Tuesday, Snowden rejected comments by critics that he was a low-level analyst. "Well, it's no secret that the U.S. tends to get more and better intelligence out of computers nowadays than they do out of people," Snowden told NBC news anchor Brian Williams. "I was trained as a...