I suggest you read "Rebel Gold" by Bob Brewer and Warren Getler for starters. Judge Advocate General Joseph Holt released an official government report to President Lincoln in October, 1864 that stated that he estimated that there were 400,000 O.A.K./KGC members in the Northwest alone at that time so you can only imagine how many there were including the South. A few that you may want to research are Gen. George Bickley, William "Bloody Bill" Anderson, Capt. Jason W. James, all of Quantrill's Guerrillas and Morgan's Raiders, Confederate Generals Sterling Price, Ben McCullough, Nathan Bedford Forrest, and Stand Watie who was the only Native American to attain the rank of General in either army of the Civil War.
~Texas Jay