Final answer:
The House Committee on Un-American Activities (HUAC) investigated communism in the American film industry post-World War II.
Explanation:
The organization responsible for investigating communism in the American film industry was the House Committee on Un-American Activities (HUAC), which began its investigations in 1947. HUAC targeted Hollywood actors, directors, and writers, accusing them of communist affiliations. This led to repercussions such as the 'Hollywood Ten' being blacklisted and some facing imprisonment.
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