Dies, Martin, Jr. (dīz), 1901–72, American political leader, b. Colorado, Tex. A lawyer, he represented Texas as a Democratic member of the U.S. House of Representatives (1931–45; 1951–59). He urged Congress to create what became the House Un-American Activities Committee House Un-American Activities Committee (HUAC), a committee (1938–75) of the U.S. House of Representatives, created to investigate disloyalty and subversive organizations. Its first chairman, Martin Dies , set the pattern for its anti-Communist investigations.
..... Click the link for more information. and was its first chairman. The committee was notorious for its exposés of alleged Communist infiltration into U.S. business and government. Dies wrote The Trojan Horse of America (1940).

Dies, Martin, Jr.

(born Nov. 5, 1901, Colorado, Texas, U.S.—died Nov. 14, 1972, Lufkin, Texas) U.S. politician. He received a law degree from National University in Washington, D.C. in 1920. After practicing law in Texas, he won a seat in the U.S. House of Representatives (1931–45, 1953–59). Though originally a supporter of the New Deal, by 1937 he had turned against it. In 1938 he was named chairman of the newly created House Un-American Activities Committee; popularly known as the Dies Committee, it pursued alleged communist subversives in New Deal agencies and labour unions. Wheareas conservatives applauded the exposure of supposedly disloyal government and union officials, liberals accused Dies of smearing reputations with unproved charges.

Dies, Martin, Jr. (1900–72) U.S. representative; born in Colorado, Texas. A lawyer and rancher in Jasper, Texas (1920–31) before going to the U.S. House of Representatives (Dem., 1931–45), he chaired the notorious Special Committee to Investigate Un-American Activities. He returned to the House (1953–59), then retired to Jasper.