disunionist

Example:The secessionist movement in the south sought to create an independent state.

Definition:A person who advocates for or engages in secession, the act of withdrawing from or leaving a union or association with another political entity.

Example:The dissenter argued that the ruling was against the will of the people.

Definition:A person who holds opinions at odds with the official or prevailing opinion in a community or government; one who rejects an official dogma, policy, or practice.

Example:The oppositionist parties boycotted the parliamentary session.

Definition:A person or group who actively opposes a policy, decision, or action; a political opponent.