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The police chief knew it would only take one rabble-rouser to turn the crowd into an angry mob.
Chickens tend to be lethargic, but there can be the occasional rabble rouser. You've seen Chicken Run, right?
Troublemaker, disobedient (adjective), rule-breaker, pest, menace, scalawag, agitator, firebrand, rabble-rouser.
To cause trouble can be variously to incite, agitate, instigate, or provoke.
A troublemaker can be an instigator, agitator, fomenter, rabble-rouser, or provocateur.
I would describe Mackenzie as a crank, a nut, a rabble-rouser, an irresponsible trouble-maker, and exactly what the Family Compact deserved.