The WGA is the Writers Guild of America.
[In their words](http://www.wga.org/uploadedFiles/who_we_are/fyi09.pdf):
> [The WGA is] a labor union composed of the thousands of writers who write the content for television shows, movies, news programs, documentaries, animation, and Internet and mobile phones (new media) that keep audiences constantly entertained and informed.
Most movies and scripted network television shows in the United States are written by writers working under a WGA contract.
* [Why is joining the WGA mandatory?](http://johnaugust.com/2009/why-is-the-wga-mandatory/ “Why is joining the WGA mandatory?”)
* [Reading scripts at the WGA library](http://johnaugust.com/2004/reading-scripts-at-the-wga-library “Reading scripts at the WGA library”)
* [Determining credit](http://johnaugust.com/2003/determining-credit “Determining credit”)
* [Why writers get residuals](http://johnaugust.com/2007/why-writers-get-residuals “Why writers get residuals”)
* [Reading scripts at the WGA library](http://johnaugust.com/2004/reading-scripts-at-the-wga-library “Reading scripts at the WGA library”)
* [Determining credit](http://johnaugust.com/2003/determining-credit “Determining credit”)
* [Why writers get residuals](http://johnaugust.com/2007/why-writers-get-residuals “Why writers get residuals”)