Jack Bushyhead was a distant cousin - our family lines diverged at the Trail of Tears - but probably the most famous. He's known to some as "The Butcher of Dachau", for machine-gunning between 125 and 350 "unarmed German soldiers." He's hated by everyone from Humanitas to some of the White Power brigades, and often used as an example of a psychotic, out-of-control soldier.
Here's a good page with pictures showing what he saw when he walked under the famous gate with the "Arbeit Macht Frei" sign:
[Only registered and activated users can see links. ]
He was court-martialled for it, but I'd like to think I would have done the same thing.