If a Tree Falls: Q&A at Sundance

Directors Marshall Curry and Sam Cullman answer questions about "If A Tree Falls." More

Filmmakers Marshall Curry ("Street Fight," POV 2005) and Sam Cullman discuss the making of "If A Tree Falls: A Story of the Earth Liberation Front" after the world premiere of their documentary at the Sundance Film Festival. They explain how they found their subjects and gained the trust of their characters. The film is slated to air on POV in September.

AIR DATE 2/3/11