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."
And if you didn't follow the guidelines, your movie just didnt get approved and/or you got purged from society at a show trial performed by the regime.