Answer: a fear of the spreading influence of the Soviet Union
What was the major motivation behind the actions of President Truman's loyalty boards and those of the House Un-American Activities Committee?

Harry S. Truman (May 8 1884 – December 26 1972) was the 33rd president of the United States serving from 1945 to 1953 succeeding upon the death of Franklin D. Roosevelt after serving as the 34th vice president . He implemented the Marshall Plan to rebuild the economy of Western Europe and established the Truman Doctrine and NATO to contain communist expansion.

The presidency of Harry S. Truman began on April 12 1945 when Harry S. Truman became President of the United States upon the death of Franklin D. Roosevelt and ended on January 20 1953.He had been Vice President of the United States for only 82 days when he succeeded to the presidency. A Democrat from Missouri he ran for and won a full four–year term in the 1948 election.

The House Committee on Un-American Activities (HCUA) popularly dubbed the House Un-American Activities Committee (HUAC) and from 1969 onwards known as the House Committee on Internal Security was an investigative committee of the United States House of Representatives. The HUAC was created in 1938 to investigate alleged disloyalty and subversive act...


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