Williams used oral history as part of his key source material in the preparation of "Huey Long", having interviewed scores of supporters and opponents of the "Louisiana Kingfish". On November 2, 1959, Williams presented the presidential address "The Gentleman from Louisiana: Demagogue or Democrat" before the Southern Historical Association. Williams told his fellow historians and their guests that Huey Long's governorship marked the end of the half-century of Louisiana history since the close of congressional Reconstruction. Before 1928, Louisiana had only 296 miles of concrete roads, 35 miles of asphalt, 5,728 miles of gravel, and three major bridges, none of which crossed the Mississippi River either at New Orleans or Baton Rouge. Trains had to uncouple and ferry across the river. By 1935, when Long was assassinated, Williams observed that the state had 2,446 miles of concrete roads, 1,308 miles of asphalt, 9,629 miles of gravel, and more than 40 major bridges. He concluded that Long was "a powerful and sometimes ruthless political boss" but not one who fit the definition of a fascist, as often claimed by Long's detractors. Williams frequently quoted the Long confidant, Harley Bozeman, wrote extensive local history in Winn Parish.