noun
anti-mainstream faction; fringe group; dissident group
Refers to a group or faction that opposes the dominant trend, ideology, or establishment within a larger organization, field, or society.
党内の反主流派が新しい政策に強く反対している。
The anti-mainstream faction within the party strongly opposes the new policy.
彼は学界の反主流派として知られている。
He is known as a dissident in academic circles.
Compound of 反 (anti-) + 主流 (mainstream) + 派 (faction, group).