Why not name the founders? Democrats.
1871
South Carolina Democrat Congressman E.W. Seibels, testifying before Congress, "They [the Klu Klux Klan] belong to the reform party - [that is, to] our party, the Democratic party."
We all know the KKK targeted blacks, but chiefly it was blacks voting Republican that was the main target, to assure the political party controlling the south would not shift, and white Republicans as well living in the south also became victims of the murderous Ku Klux Klan.