"The Red Power Movement and the Yankton Sioux Industries Pork-processing Plant Takeovers of 1975"
https://sdshspress.com/journal/south-dakota-history-36-2/the-red-power-movement-and-the-yankton-sioux-industries-pork-processing-plant-takeovers-of-1975
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"The Red Power Movement and the Yankton Sioux Industries Pork-processing Plant Takeovers of 1975"