The Truman Committee, formally known as the Senate Special Committee to Investigate the National Defense Program, was a United States Congressional investigative body, headed by Senator Harry S. Truman. The bipartisan special committee was formed in March 1941 to find and correct problems in US war production with waste, inefficiency, and war profiteering. The Truman Committee proved to be one of the most successful investigative efforts ever mounted by the U.S. government: an initial budget of $15,000 was expanded over three years to $360,000 to save an estimated $10–15 billion in military spending and thousands of lives of U.S. servicemen. For comparison, the entire cost of the simultaneous Manhattan Project, which created the first atomic bombs, was $2 billion. Chairing the committee helped Truman make a name for himself beyond his political machine origins and was a major factor in the decision to nominate him as vice president, which would propel him to the presidency after the death of Franklin D. Roosevelt.

Harry S. Truman was the 33rd president of the United States, serving from 1945 to 1953. A member of the Democratic Party, he previously served as a United States senator from Missouri from 1935 to 1945 and briefly as the 34th vice president in 1945 under Franklin D. Roosevelt. Assuming the presidency after Roosevelt's death, Truman implemented the Marshall Plan in the wake of World War II to rebuild the economy of Western Europe and established both the Truman Doctrine and NATO to contain the expansion of Soviet communism. He proposed numerous liberal domestic reforms, but few were enacted by the conservative coalition that dominated the Congress.