sergeant at arms

from WordNet (r) 3.0 (2006)

sergeant at arms
    n 1: an officer (as of a legislature or court) who maintains
         order and executes commands [syn: {sergeant at arms},
         {serjeant-at-arms}]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

SERGEANT AT ARMS, An officer appointed by a legislative body, whose duties 
are to enforce the orders given by such bodies, generally under the warrant 
of its presiding officer.

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