Final answer:
The film 'The Salt of the Earth' was blacklisted during the Cold War era due to its pro-Mexican message and critique of US immigration policies. It portrayed the struggles of Mexican-American workers and their fight for better working conditions and civil rights.
Step-by-step explanation:
The film 'The Salt of the Earth' was blacklisted during the Cold War era in the United States. The blacklist was a result of the political climate at the time, where there was a fear of communism and a suspicion of individuals or works that were considered politically left-leaning or critical of the government.
The film itself was seen as controversial because it was pro-Mexican and critical of the US stance on immigration. It portrayed the struggles of Mexican-American workers facing discrimination and their fight for better working conditions and civil rights.
The film's pro-Mexican message and its critique of US immigration policies were considered subversive and contrary to the dominant anti-communist narrative, leading to its blacklisting and difficulty in finding distribution and screening opportunities.