共きょう鳴めい者しゃ

noun

sympathizer; fellow traveler

Refers to a person who agrees with or supports a political or ideological movement, often without being an official member. Can carry a slightly dated or political nuance.

• 彼かれはその政せい党とうの共きょう鳴めい者しゃだが、党とう員いんではない。

  He is a sympathizer of that political party, but not a member.