Pawnees Sioux?

Custer's relatives can't sue movie makers about slandering him long after his death, and I guess that Indian tribes can't sue about slanders in their history.

In the Command (1954) a unit in 1876 is followed by hostiles belonging to a strange assortment of tribes including Arapaho, Cheyenne, Fox, Sac, Omaha (or Otoe?) and Pawnees. When a Colonel Janeway hears about the Pawnees he says that they can't be that far west.

In Pawnee (1957) a wagon train is attacked by Pawnees, in The Raiders (1963) a cattle drive fears being attacked by Pawnees and is attacked by Pawnees, and in Little Big Man (1970) Jack Crab's wagon train was attacked by Pawnees.

But in real history the Pawnees were not hostile and The Pawnee Battlion of scouts and allies fought on the US side in various Indian Wars from 1865 to 1877.

So I guess the Pawnee Nation would Sioux, I mean sue, movie makers over the depiction of their ancestors if they could.