WordNet (r) 3.0 (2006):

Rasputin
    n 1: Siberian peasant monk who was religious advisor in the
         court of Nicholas II; was assassinated by Russian noblemen
         who feared that his debauchery would weaken the monarchy
         (1872-1916) [syn: Rasputin, Grigori Efimovich Rasputin]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "Rasputin":
   Svengali, VIP, access, bad influence, big wheel, court,
   eminence grise, five-percenter, friend at court, good influence,
   gray eminence, heavyweight, hidden hand, influence,
   influence peddler, influencer, ingroup, key, kingmaker, lobby,
   lobbyist, lords of creation, man of influence, manipulator,
   open sesame, powers that be, pressure group, sinister influence,
   special interests, special-interest group, the Establishment,
   very important person, wheeler-dealer, wire-puller