loyalist

noun1

1. •
   A person who is loyal to a cause, generally used as a political affiliation.

   • Most estimates place one-third of Americans as loyalist, one-third on the fence, to be swayed by whomever was winning, and one-third rebel. — 1999

noun4

1. •
   A member of any specific loyalist faction.
2. •
   (US, Canada) A person from the 13 Colonies on the eastern seaboard of North America who remained loyal to the British Empire during the American Revolution.
3. •
   (UK, Ireland) A person who supports Northern Ireland remaining loyal to the United Kingdom instead of eventually uniting with the Republic of Ireland, especially one who accepts or advocates violence for the cause.
4. •
   (Canada, historical) Short for United Empire Loyalist, such colonists who migrated to Canada.