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Visas and academic accreditation shouldn't be leverage against speech the government disagrees with, they should be granted and removed according to a predictable and unbiased process.
Really all government actions should follow a predictable and unbiased process, a.k.a "The Law".
I'm not altogether certain I'd rely on "Rule of Law" to save anyone in the current environment.
But then such things are expected with the current kakistocracy.
What law do these deportations violate?
But in case it is, the bevy of judgments on this issue is recommended reading.