paid agitator
A cheap mercenary hired only to start trouble and destroy reputations with bad words. They will sell your soul for a quick buck if you ask nicely.
Don't trust that guy who texts me insults; he is probably just a paid agitator looking for extra cash on the side tonight.
The news channel uses a paid agitator to insult my grandma so they can boost their ratings higher tomorrow morning.
I caught him taking orders from a boss like a cheap paid agitator who hates everyone except his own team.