Possible Clues:

• Mean (extremely so) of 3 into 5151 + 100
• Highly corrosive
• Acrimonious civil riot out of control
• Civil unrest involves group of 26 dropping by, becoming bitterly abusive
• Hate-filled violent riot during civil disorder
• Angry civil riot expressing intense ill-will
• Bitterly critical
• Bitter players engaged in civil disorder
• Very bitter civil unrest about 14
• Break up civil riot expressing considerable bitterness