When It Comes to Professional Performers, Understanding Union Regulations Is Essential. the Screen Actors Guild - American Federation of Television and Radio Artists (Sag-Aftra) Plays a Significant Role in the Industry, Offering a Comprehensive "Sag-Aftra Waiver List." This List Outlines the Circumstances Under Which Waivers May Be Granted, Allowing Productions to Deviate from Certain Union Rules and Regulations.