Kim Philby was one of the most notorious double agents Britain ever produced. For three decades he secretly worked for the Soviet Union, passing secrets to MI6. BBC News has now uncovered a previously-unseen video recording of Philby giving a lecture to East German Stasi agents in 1981. He describes how for years he walked out of his office with a briefcase stuffed with secret papers. He believes he avoided suspicion because of his upper-class background. The damage that can be caused by a spy in your midst can be considerable.”]
Source: https://grahamcluley.com/kim-philby-spy-insider-threat/