Riot
The Riot is a form of civil disorder characterized often by disorganized groups lashing out in a sudden and intense rash of violence against authority, property or people. While individuals may attempt to lead or control a riot, riots are typically chaotic and exhibit herd behavior, and usually generated by civil unrest.
Riots often occur in reaction to a perceived grievance or out of dissent. Historically, riots have occurred due to poor working or living conditions, government, oppression, taxation or conscription, conflicts between ethnic groups, food supply or religions (see race riot, sectarian violence and pogrom), the outcome of a sporting event (see football hooliganism) or frustration with legal channels through which to air grievances