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, its 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. And Ive done that at all levels from – from the bottom on the ground all the way to the top. He said he worked undercover overseas for both the CIA and NSA and lectured at the Joint Counterintelligence Training Academy where I developed sources and methods for keeping our information and people secure in the most hostile and dangerous environments around the world. So when they (critics) say Im a low-level systems administrator, that I dont know what Im talking about, Id say its somewhat misleading, Snowden added.