[“Salt of the Earth”] was to be the story of the miners fighting against a giant company, of Chicanos and Anglos, and of miners and their families. The miners were to play themselves, and it was to be filmed on site. The crew was made up of blacklisted technicians, and only two professional actors would appear in the film: blacklisted Will Geer (the Sheriff, and who later went on to play the Grandpa on The Waltons on television), and Mexican actress Rosuara Revueltas (Esperanza). The final result, The Salt of the Earth, was a controversial film. Not only was the film about striking miners, whom the general public viewed to be either Communists or Communist-influenced, but the story focused on a Chicano community at a time when attitudes about Chicanos were changing. Throughout the Great Depression, official attitudes toward Mexican immigration and trans-border migration had grown increasingly hostile, as Anglos clamored in the depressed economy to take jobs that had traditionally belonged to Mexican immigrants. Throughout the 1940s and 1950s, the movement towards closing the porous border at the Rio Grande had culminated in “Operation Wetback” in 1953, a government program designed to find and deport illegal Mexican aliens. These tensions were made more complex by the fact that many “Mexican-American immigrants” had, in fact, been on their lands longer than those lands had been a part of the United States, becoming U.S. citizens by virtue of the Treaty of Guadalupe Hidalgo that ended the Mexican American War in 1848.