What organization represents the interests of stage actors in the United States?

The Actor's Equity Association is the organization that represents the interests of stage actors in the United States. This union is specifically focused on protecting and advocating for the rights of professional theater performers and stage managers. It ensures fair wages, safe working conditions, and quality treatment for its members in theatrical productions. By negotiating contracts and establishing industry standards, the Actor's Equity Association plays a crucial role in supporting the theatrical community and enhancing the working conditions for those in the field.

In contrast, the other organizations listed serve different sectors within the entertainment industry. The Screen Actors Guild primarily represents film and television actors, focusing on media other than live theater. The American Federation of Musicians advocates for musicians, covering those who perform music, rather than actors involved in live performances. Lastly, the International Alliance of Theatrical Stage Employees is involved with various technical aspects of theater production, such as staging and crew members, rather than the performers themselves. Therefore, while all these organizations play significant roles in their respective areas, the Actor's Equity Association is uniquely dedicated to stage actors.