Point of information, folks!
As a cinema history buff, the most powerful figure in all Hollywood, even more influential in fact than Selznick, was Darryl F. Zanuck, a W.A.S.P., and a man in NOBODY's pocket, least of all Jack Warner (a Jew from Youngstown, Ohio).
The second most influential was a gentile as well, a man known as Will Hays, whose Hays Code probably influenced more of Hollywood movie policy than anyone else.
The third most influential post Zanuck, is/was Jack Valenti, a born again Christian:-)
So much for the usual anti-Semitic tropes.