Trade union official (9)
(Other definitions for shop steward that I've seen before include "Trade union representative" , "Workers' representative" , "Unionist" , "One who's organizing hands" , "Workplace representative of unionised employees" .)
(Other definitions for organiser that I've seen before include "Rosie rang the person in charge of the arrangements" , "Manager" , "One in charge" , "Maker of arrangements" , "bound to keep personal data" .)