rioter

noun

1. One who riots; part of the unruly violent crowd causing a riot.

   “The rioters had erected a makeshift barricade and were pelting the police with rocks from behind it.”

   “The rioters overshadowed the message of peaceful protesters on prior days: They had called for justice for Gray, a 25-year-old African-American man who died from spinal injuries after police arrested him this month.”

   “High-profile January 6 rioter Guy Reffitt showed up in Washington, DC, on Wednesday to celebrate with his wife and supporters who’d been hoping for his release from federal detention for months.”