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At common law the status as an alien was not a categorical bar to habeas corpus relief. See, e.g., Sommersett’s Case, 20 How. St. Tr. 1, 80-82 (1772) (ordering an African slave freed upon finding the custodian’s return insufficient); see generally Khera v. Secretary of State for the Home Dept., [1984] A. C. 74, 111 (“Habeas corpus protection is often expressed as limited to ‘British subjects.’ Is it really limited to British nationals? Suffice it to say that the case law has given an emphatic ‘no’ to the question”). We know as well that common-law courts entertained habeas petitions brought by enemy ...