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PBS Premiere: Sept. 13, 2011Check local listings »
Encore Broadcast: Oct. 11, 2012


This provocative film lifts the veil on a radical environmental group that the FBI calls America's "number one domestic terrorism threat."

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Watch Video for If a Tree Falls
ELF Operations
Additional Video
Sam Cullman
Filmmaker Interview
Is it Terrorism?
Classroom Clip
Marshall Curry
Filmmaker Interview
If A Tree Falls: Q&A at Sundance
Filmmaker Interview