loyalist

One who maintains loyalty to an established government, political party, or sovereign, especially during war or revolutionary change.

One who supported the established government of Spain during the Spanish Civil War.

A partizan supporter of an existing government; one who opposes insurrection or revolution.

Specifically, in the American Revolution, a Tory.

A person who adheres to his sovereign or to the lawful authority; especially, one who maintains his allegiance to his prince or government, and defends his cause in times of revolt or revolution.

A person who is loyal to a cause, generally used as a political affiliation.

a person who is loyal to their allegiance (especially in times of revolt)