Hollywood was in a transitional period in the mid 1930s and into the 1940s. The self-censorship of the studio system culminating in the formation of the PCA changed the ability of filmmakers to portray certain aspects of American life. A particularly interesting case is found in examining The Grapes of Wrath (1940). Because of the fact that the story existed first as a novel written with complete freedom of expression, it made for a useful comparative analysis of theme. The combination of the constraints of censorship, the director's stylistic predilections, and the inherently unique quality of visualization in the medium of film made for widely contrasting themes in The Grapes of Wrath the film, and novel.