John Bull
Rasputin
Svengali
Uncle Sam
VIP
Washington
Whitehall
access
bad influence
baron
big gun
big man
big name
big wheel
bigwig
brass
brass hat
bureaucracy
celebrity
court
dignitary
dignity
directorate
elder
eminence grise
father
figure
five-percenter
friend at court
good influence
gray eminence
great man
heavyweight
hidden hand
hierarchy
higher echelons
higher-ups
important person
influence
influence peddler
influencer
ingroup
interests
key
kingmaker
lion
lobby
lobbyist
lords of creation
magnate