Feds Really Do Fear Hippy Terror
The article cites two sources, the recent, declassified National Intelligence Estimate that cites "leftist, nationalist, or separatist groups" and the Department of Homeland Security's "Cyber Storm" wargame. The villians in "Cyber Storm" are radical leftists, the "Worldwide Anti-Globalization Alliance" (someone, at least, had a sense of humor when naming the group).
Everyone knows we should be afraid of anarchists; they're so well oranized, you know.