High Quality Content by WIKIPEDIA articles! Robert Emmet Hannegan (June 30, 1903 October 6, 1949) was a St. Louis, Missouri politician who served as Commissioner of Internal Revenue from October 1943 to January 1944. He also served as chairman of the Democratic National Committee from 1944 to 1947 and United States Postmaster General from 1945 to 1947. After his political career, in 1947, Hannegan and partner Fred Saigh purchased the St. Louis Cardinals of Major League Baseball. But Hannegan, ill with heart disease, sold his share in the team to Saigh a few months before his death. Hannegan earned an LL.B. from Saint Louis University School of Law in 1925. A power broker in the St. Louis Democratic Party allied with Senator Bennett Clark, Hannegan helped save the political career of Harry S. Truman in 1940 following the tax fraud conviction of Truman's ally, Kansas City boss Tom Pendergast. Hannegan supported Truman for re-election to the U.S. Senate when he was challenged in theDemocratic primary by Governor Lloyd C. Stark and Maurice M. Milligan, who both sought credit for bringing down Pendergast.