Bolshevik
Bolshie
Greek
Red
ace
adjunct
affiliate
ally
amigo
associate
auxiliary
bedfellow
bedmate
belonger
bosom buddy
brother
brother-in-arms
buddy
bunkie
bunkmate
butty
camarade
card-carrier
card-carrying member
cardholder
chamberfellow
charter member
chum
classmate
clubber
clubman
clubwoman
coachfellow
coadjutor
cohort
colleague
comate
commie
committeeman
companion
company
compatriot
compeer
confederate
confrere
consociate
consort
Communist
friend
camaraderie
comradeliness
comradery
comradeship
cousin
foe
follower
lad
lieutenant
lover
neighbors
partner
sailor
servant
sir
soldier
warrior