K.G.C

 The Knights of the Golden Circle, or KGC for short, were a secret society of wealthy Southern loyalists formed just before the Civil War, devoted not just to defending their values (i.e. owning all the slaves they wanted) but conquering parts of Mexico, Central America, and Cuba to create a Confederate empire. Their members had an abundance of gold and weapons, and purportedly some infamous members, including Jesse James (whose robberies may have contributed to the KGC secret stash) and John Wilkes Boot

In fact, the assassination of President Abraham Lincoln may have been a KGC plot from the beginning, at least according to word-of-mouth legends. The KGC disappeared just a few decades after the war ended, or so it appeared, leaving behind one of the greatest unsolved mysteries of the world. There's still speculation that they just went deeper into hiding, and continue their plots to overthrow the US federal government.