revolutionist (n.)

• agitator
• anarchist
• antinomian
• brawler
• extreme
• extremist
• fanatic
• insurgent
• insurrectionist
• malcontent
• maverick
• mutineer
• nihilist
• nonconformist
• pink
• pinko
• radical
• rebel
• red
• revolutionary
• rioter
• subversive
• syndicalist
• terrorist
• traitor
• ultra
• ultraconservative