MIB: The five… ah, four, directorates of Imperial State Security would be horrified to ever be this unsubtle – as would, for that matter, the Librarians of Silence – and, frankly, even when secrets need to be kept, they know perfectly well that eldrae don’t intimidate worth a damn. Using any standard MIB tactics short of actual memory redaction is probably the surest way to get whatever knowledge you were concerned to keep secret spread absolutely everywhere on general principles.
Got to be persuasive, and disappear stuff quietly.