In Lincoln,Nebraska,in the summer of 2009,two groups held rallies about health care,one supporting and one opposing legislation proposed to overhaul America's health-care system.At one point,the two groups went beyond holding signs and shouting slogans,and tempers flared.Objects were thrown,shoving matches broke out,and the police had to step in to break up the:

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The description of objects being thrown and shoving matches breaking out suggests a violent disturbance, which would classify as a riot rather than a peaceful rally, social movement, or march.

In Lincoln,Nebraska,in the Summer of 2009,two Groups Held Rallies About