SCOTUSblog Coverage of Patchak Decision

Here.

And their plain language description:

In this case, the federal government took certain land into trust for an Indian tribe, which means that it took ownership of the land to allow the tribe to use it. The tribe planned to build a casino on the land. The Supreme Court held that a neighbor could sue the government to stop the casino project on the ground that the law did not permit the government to take the land into trust for this particular tribe

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