agitator (n.)

• activist
• agitprop
• beater
• blender
• brawler
• catalyst
• churn
• crucible
• demagogue
• eggbeater
• emulsifier
• extremist
• firebrand
• fomenter
• incendiary
• inciter
• instigator
• insurgent
• insurrectionist
• malcontent
• maverick
• mischief-maker
• mixer
• mover
• mutineer
• nonconformist
• paddle
• provocateur
• provoker
• rabble-rouser
• rebel
• revolutionary
• revolutionist
• ringleader
• rioter
• rouser
• shaker
• subversive
• traitor
• troublemaker
• urger
• vibrator
• whisk