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This story covers the rising threat of eco-terrorists in the U.S. In May, 2005, John Lewis, Deputy Director of the FBI, testified on Capitol Hill that domestic terrorism by radical environmental groups such as the Earth Liberation Front and the Animal Liberation Front were the biggest threat to American security. 60 Minutes set out to either prove or disprove Lewis' testimony and found that, indeed, such groups were responsible for a rising number of arson and bomb attacks.