adviser
agent
announcer
annunciator
authority
champion
channel
communicant
communicator
connection
debater
declaimer
delegate
demagogue
deputy
enlightener
expert witness
front
front man
go-between
gossipmonger
grapevine
haranguer
herald
informant
information center
information medium
informer
interagent
interceder
intercessor
intermediary
intermediate
intermediate agent
intermediator
intermedium
internuncio
intervener
interventionist
interventor
interviewee
jawsmith
mediator
medium
middleman
monitor
mouth
mouthpiece
interpreter
representative
spokesperson
voice
activist
administrator
advocate
aide
chairman
commissioner
committee
delegation
director
headquarters
investigator
leadership
negotiator
personnel
secretary
spokeswoman
supporter