The leader of the Cheyenne River Sioux in South Dakota is urging all opponents of the Dakota Access oil pipeline to boycott businesses in North Dakota's capital city.
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The tribal council voted in September to not spend money in Bismarck, and Chairman Harold Frazier at the time called on all tribal members to join the effort.
Frazier wrote a letter to other tribal leaders and supporters on Tuesday hoping to broaden the boycott.
Bismarck City Administrator Keith Hunke (HUHNK'-ee) says that's disappointing because Bismarck isn't involved in the dispute over the $3.8 billion pipeline that's to carry North Dakota oil to Illinois.
The Cheyenne River and Standing Rock Sioux tribes are fighting the project, saying it threatens reservation drinking water and cultural sites.