Eric Johnston, president of the US Chamber of Commerce and MPAA:
"We'll have no more Grapes of Wrath, we'll have no more Tobacco Roads. We'll have no more films that show the seamy side of American life. We'll have no pictures that deal with labor strikes. We'll have no pictures that deal with the banker as villain."
check out the book National Security Cinema
https://www.goodreads.com/book/show/35521540-national-security-cinema