Knocking
- Bliain: 2006
- Tír: United States of America
- Seánra: Documentary
- Stiúideo: Corporation for Public Broadcasting, Open Door Productions, ITVS
- Eochairfhocal: holocaust (shoah), bible, blood transfusion, civil liberties, jehovah's witness, the watchtower
- Stiúrthóir: Tom Shepard, Joel Engardio
- Caitheadh: Jason Edling, Seth Thomas, Joseph Kempler, Lillian Gobitas-Klose