fellow traveler

from WordNet (r) 3.0 (2006)

fellow traveler
    n 1: a communist sympathizer (but not a member of the Communist
         Party) [syn: {fellow traveler}, {fellow traveller}]
    2: a traveler who accompanies you [syn: {companion}, {fellow
       traveler}, {fellow traveller}]

from Moby Thesaurus II by Grady Ward, 1.0

44 Moby Thesaurus words for "fellow traveler":
      Bolshevik, Bolshevist, Castroite, Communist, Communist sympathizer,
      Leninist, Maoist, Marxist, Marxist-Leninist, Red, Stalinist,
      Titoist, Trojan horse, Trotskyist, Trotskyite, avowed Communist,
      bodyguard, bolshie, cavalier, chaperon, collaborationist,
      collaborator, commie, companion, conductor, convoy, crypto, duenna,
      escort, esquire, fifth column, fifth columnist, fraternizer, guard,
      revisionist, saboteur, safe-conduct, security risk, shepherd,
      squire, subversive, swain, underground, usher