A derogatory name for a far left politically leaning person, a socialist/communist, In reference to notorious communist and people's temple leader Jim Jones, the perpetrator of the Jonestown Massacre, with whom they share the same ideology.
person 1: 'hey, i saw brad reading the communist manifesto the other day, what's up with that?'
person 2: 'he's a jim, stay away from that vermin'
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