Conversation so far:
What was the Screen Actors Guild like in the early days?
In 1925, the Masquers Club was formed by actors discontented with the grueling work hours at the Hollywood studios. This led to the creation of the Screen Actors Guild.
Were the actors in favor of Screen Actors Guild?
Many high-profile actors refused to join SAG initially.
When was the Screen Actors Guild started?
1933
What were the advantages of the Screen Actors Guild for the actors?
Producers made an agreement amongst themselves not to bid competitively for talent.

Question: Who received the most benefit from this union?
Self-contained rewrite: Who received the most benefit from the Screen Actors Guild union?