Counterterrorism agents at the Federal Bureau of Investigation have conducted numerous surveillance and intelligence-gathering operations that involved, at least indirectly, groups active in causes as diverse as the environment, animal cruelty and poverty relief. One F.B.I. document...talks of the Catholic Workers group's semi-communistic ideology." The documents...came as part of a series of Freedom of Information Act lawsuits brought by the American Civil Liberties Union. The latest batch of documents...totals more than 2,300 pages and centers on references in internal files to a handful of groups, including PETA, the environmental group Greenpeace and the Catholic Workers group, which promotes antipoverty efforts and social causes. Many of the investigative documents turned over by the bureau are heavily edited. The documents indicate that in some cases, the F.B.I. has used employees, interns and other confidential informants within groups like PETA and Greenpeace to develop leads on potential criminal activity and has downloaded material from the groups' Web sites, in addition to monitoring their protests.

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