Writers Guild of America, East
- Eastern branch of the labor union, promoting and protecting the professional and artistic interests of writers in the motion picture, television, radio and communications industries.
- http://www.wgae.org/

Writers Guild of America, West
- Official union site representing writers in the motion picture, broadcast, cable and new media industries. Find resources covering craft, markets, and representation.
- http://www.wga.org/

Worldwide Writers Copyright Association
- Offers copyright protection for screenplays, books and other literary works. Offers a script marketplace, legal contracts, and tools for the film industry.
- http://www.wcauk.com/