An undercover informant helped investigators tape a conversation with one of the seven...radical environmentalists accused in a series of arson attacks and other crimes... Existence of the informant was disclosed last week by an investigator in U.S. District Court in Brooklyn, N.Y., during a bail hearing for Daniel McGowan, 31, who faces indictments that he and another man firebombed the office of a wood products mill in Glendale and the office and truck shop of a tree farm in Clatskanie in 2001. The Earth Liberation Front, an underground group that advocates economic sabotage to stop environmental destruction, took credit for...