What is another word for "reactionist"?

Roget's Thesaurus (1911) lists these synonyms for "reactionist": action, adversary, adverse, and, antagonist, assailant, back, bete, boomerang, bounce, bound, brangler, brawler, coefficient, collision, competitor, contrecoup, demagogue, direction, disputant, echo, elastic, elasticity, enemy, equal, every, filibuster, fly, for, force, kick, malcontent, obstructionist, obstructive, opponent, opposite, opposition, oppositionist, other, party.