Final answer:
The Screen Actors Guild, founded in 1933 and currently known as SAG-AFTRA, is the union for actors in the entertainment industry which advocates for their rights and fair working conditions.
Step-by-step explanation:
The actors' labor union founded in 1933 is The Screen Actors Guild (SAG), which is now known as SAG-AFTRA after merging with the American Federation of Television and Radio Artists. This union is a pivotal part of the entertainment industry, helping to protect the rights of actors in film, television, and other digital media platforms. The employment opportunities provided by these media giants, although global, are often governed under the jurisdiction of SAG-AFTRA, ensuring actors have access to fair working conditions and benefits. While the potential for high earnings and celebrity status draws many to the acting profession, it is also an incredibly competitive field where many more actors struggle to achieve those heights of success in comparison to those who do become well-known.