MANDAN, N.D. (AP) — A Texas pipeline company's lawsuit accusing Greenpeace of defamation, disruptions and attacks during protests against the Dakota Access Pipeline goes to trial in North Dakota on Monday, in a case the environmental advocacy organization says threatens free speech rights and its very future.

The lawsuit stems from the in 2016 and 2017 over the oil pipeline's planned Missouri River upstream from the Standing Rock Sioux Tribe's reservation. The tribe has long argued that the pipeline threatens its water supply. Of the thousands of people who protested the project, hundreds were arrested.

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