A decade ago in Wisconsin, angry racial confrontations became everyday news when Indians began spearfishing under restored treaty rights. The same rights have been upheld in Minnesota. This spring members of the Mille Lacs and seven other Ojibwa bands are spearing and gillnetting walleye on waters in east-central Minnesota, including Lake Mille Lacs. Some worry the same kinds of confrontations could happen here. But as Leif Enger reports, the long battle over treaty rights has already strained relations between Indians and whites.