Question: Which 2006 documentary film tells the stories of three Jehovah's witnesses who, amongst other Witness teachings, claim the right to refuse to perform military service on the grounds of freedom of religion?
Sentence (from "Knocking (film)"): Knocking is a 2006 documentary film directed by Joel Engardio and Tom Shepard that focuses on the civil liberties fought for by Jehovah's Witnesses.
Relevant evidence: Yes