A 14-year-old girl stoops and screams above the body of a Kent State University student killed in 1970 by an Ohio National Guardsman.
A police chief aims his gun at a Vietcong prisoner's head in 1968, while executing him on a Saigon, Vietnam, street.
And in 1989, an unarmed man in Beijing, China, stands defiantly in front of a column of tanks as they rolled into Tiananmen Square. 
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All About Iran • Mahmoud Ahmadinejad