persons who speed up the progress of something. In a Scientologyorg, a person newly hired is put under HCO and assigned as an expeditor while rapidly completing his basictraining. He is not put on a post, but fills in temporarily in spots of overload to expedite the backlog and get flows (movements of particles between two points) moving. See also Hubbard Communications Office in this glossary.persons who speed up the progress of something. In a Scientologyorg, a person newly hired is put under HCO and assigned as an expeditor while rapidly completing his basictraining. He is not put on a post, but fills in temporarily in spots of overload to expedite the backlog and get flows (movements of particles between two points) moving. See also Hubbard Communications Office in this glossary. @ Attendance is mandatory for all staff, including expeditors.