“[T]he whole theory of [the grand jury’s] function is that it belongs to no branch of the institutional government, serving as a kind of buffer or referee between the Government and the people,” United States v. Williams, 504 U.S. 36, 47 (1992), “pledged to indict no one because of prejudice and to free no one because of special favor.” Costello v. United States, 350 U.S. 359, 362 (1956). If the grand jury were not protected against corrupt interference from all persons, its function as an independent charging body would be thwarted. And an impartial grand jury investigation to determine
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