A group involved in a riot is often referred to as a mob or a rioting crowd.
A person engaged in rioting is called a rioter.
"Rioters" is the collective name given to a group of people who are "rioting". "Rioting" is the act of taking part in a violent public disturbance.
a mob?
TRIUMVIRATE which is a group of 3 people
government
A group of persons who work, play, or act together could be called a team or group. In the workplace, they might be called a work group.
Mob, horde, and rabble are some names for rioting groups.
A singing group of three is called a "trio."
That is called a consortium.
A group of four people singing is called a quartet.
the great fear