Southern Committee to Uphold the Constitution

The most important of these [du Pont funded fascist] organizations was the Southern Committee to Uphold the Constitution (SCUC). Its goal was the creation of a mass movement of whites in the South, in the hope of robbing Roosevelt of his Dixie vote and also, through stirring up anti-Black racism, attacking the organizing drives of CIO unions from the North. It's chairman was Texas oil magnate and former National Association of Manufacturers president, John H. Kirby. Vance Muse, editor of The Christian American and right-hand man of John Kirby, circulated "a picture of Mrs. Roosevelt going to a Negro meeting with a Negro escort on either side of her" (New York Times, April 13, 1936). The SCUC leaflet read, "President Roosevelt has … permitted Negroes to come to the White House banquet table and sleep in the White House beds." Muse said of New Deal labor policies, "White women and white men will be forced into organizations with black African apes whom they will have to call 'brother' or lose their jobs."
Source: Gerard Colby, from the chapter, "Decade of Despair," Du Pont Dynasty: Behind the Nylon Curtain. (Secaucus: Lyle Stewart, 1984), pp. 347-357.

The conservative Baltimore Sun described it [the SCUC] as 'a hybrid organization financed by northern money, but playing on the Ku Klux Klan prejudices of the south.' Its sponsor, John H. Kirby, collaborated in anti-Semitic drives against the New Deal with the Reverend Gerald L. K. Smith, leader of the first Silver Shirt squad of American storm troopers."]
Source: Jules Archer, in The Plot to Seize the White House, p.31,

In 1934 [Vance] Muse and [John Henry] Kirby organized the Southern Committee to Uphold the Constitution, financed mostly by the DuPonts and other northern industrial interests, in an effort to prevent Franklin D. Roosevelt's reelection. Two years later Muse was the leading organizer of Christian Americans, a group he formed to combat what he perceived as radicalism and subversive influences throughout the country. He believed that organized labor in the United States was the source of much communistic influence, and thus he led Christian Americans to support the antiunion movement. During and shortly after World War II, when laws to regulate and curb unions were passed in Texas and other southern states, Muse was a leading lobbyist in this effort. The Christian Americans worked for passage of right-to-work laws in sixteen states
Source: "Vance Muse"

A strategy of deception favored by the Republican Establishment was to subsidize fascist, antidemocratic organizations with very officialsounding, “democratic” names. The American Liberty League was suchan organization. In turn, the [American] Liberty League subsidized other such groups.The Southern Committee to Uphold the Constitution was one of them. It was formed to provoke fear and hatred of blacks, and to deprive the president of his southern vote. The chairman of this racist organization was a past president of the National Association of Manufacturers.
Source: The American Bully - Part II Chapter Three

Who funded the Southern Committee to Uphold the Constitution?

For a sizable list of donors to the American Liberty League and its front groups (for example, the Sentinels of the Republic, Crusaders, Southern Committee to Uphold the Constitution, and other fascist American organizations in the 1930s), refer to a table of data prepared by Senator Black (originally published in the Digest of Data, Special Committee to Investigate Lobby Activities, 74th Congress 2nd Session). It was later published in 1000 Americans, by George Seldes, Boni & Gaer, 1947, p. 292-298.
This table of data on donations to American fascist organizations is now availale online by Glen Yeadon, The Nazi Hydra in America, 2004.
"Appendix 1: Big Donors to the Pro-Nazi Groups, The 1930s: Nazis Parading on Main Street."