lobby

Noun

• a group of people who try actively to influence legislation

• the people who support some common cause or business or principle or sectional interest

• a large entrance or reception room or area

Verb

• detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors

Related words

• Synonyms: 
  pressure group , third house , anteroom , antechamber , entrance hall , hall , foyer , vestibule , buttonhole