Synonym of agitator (“one who stirs up or excites others, for example political reformers”)
An entrenched or aggressive adherent to a particular cause, now especially a member of a particular ideological faction.
Specifically, someone who supports the Trotskyist political view expressed in the newspaper Militant, or who engages in aggressive left-wing politics.
Fighting or disposed to fight; belligerent, warlike.
Aggressively supporting of a political or social cause; adamant, combative.