How did the correspondents dinner become a Hollywood affair? All news is info-entertainment and all entertainment is propaganda.
Those in Hollywood didn’t always get where they are for being the brightest people in the room. Go to the Party meetings and you are in. Go to rally for the “wrong” party and you will be blacklisted although Hollywood will never talk about it as they do when Americans noted who was a Red in Hollywood.
Back then, a Communist could still use a pseudonym and those working around him were aware of his politics (it kept him off of boycott lists because the public wouldn’t know). Today, fat chance getting A-list work as a conservative.