Riot
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A riot or mob violence is a form of civil disorder commonly characterized by a group lashing out in a violent public disturbance against authority, property, or people.
Teamsters, armed with pipes, riot in a clash with police in the Minneapolis Teamsters Strike of 1934 during the Great Depression.
Anti-Sarkozy rioters wearing scarves to conceal their identity and filter tear gas in Paris, France in May 2007
New York police attacking unemployed workers in Tompkins Square Park, 1874.
March for Alternative - 25 student anarchist rioters damage storefront windows in protests against the IMF
Police riot
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A police riot is a riot carried out by the police; more specifically, it is a riot that police are responsible for instigating, escalating or sustaining as a violent confrontation. Police riots are often characterized by widespread police brutality, and they may be done for the purpose of political repression.
Helmet and baton used by Chicago police officers during the 1968 Democratic National Convention, where the term "police riot" was popularized