Final answer:
The House Un-American Activities Committee (HUAC) investigated communist threats in the U.S. during the post-World War II era.
Explanation:
The House Un-American Activities Committee (HUAC) served the country by investigating communist threats throughout the United States and beyond. Established in 1939, HUAC conducted investigations into alleged instances of subversion and disloyalty among federal employees, Hollywood actors, writers, poets, and others. The committee played a significant role in the post-World War II era, restricting criticism of the government during that time.
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