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Rh id., at 383 (Amtrak “must be regarded as a Government entity for First Amendment purposes”); id., at 392 (Amtrak is “a Government entity for purposes of determining the constitutional rights of citizens”); id., at 394 (Amtrak is an “instrumentality of the United States for the purpose of individual rights guaranteed against the Government”); id., at 397, 399, 400 (similar, similar, and similar). But for other purposes, a different rule might, or would, obtain. Our holding, we said, did not mean Amtrak had sovereign immunity. See id., at 392. And most relevant here, we reaffirmed that “[t]he State does not, by becoming a corporator, identify itself with the corporation” for purposes of litigation. Id., at 398. Or said again, the Government is “not a party to suits brought by or against” its corporation. Id., at 399. So what Lebron tells us about MOHELA is that it must comply with the Constitution. Lebron offers no support (more like the opposite) for the different view that MOHELA and Missouri are interchangeable parties in litigation.