Demonstrators do push-ups Friday as others block motorists along Chicago's Michigan Avenue as they protest the shooting of Laquan McDonald who was killed by a police officer in 2014. Joshua Lott/Getty Images hide caption

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Robert Lewis Dear, 57, is accused of attacking a Planned Parenthood clinic in Colorado Springs and killing three people, including a police officer. Nine others were injured. Colorado Springs Police Department hide caption

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This undated photo shows Rosa Parks riding on the Montgomery Area Transit System bus. Parks refused to give up her seat on a Montgomery bus on Dec. 1, 1955, and ignited the boycott that led to the end of legal segregation in public transportation. AP hide caption

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Demonstrators march through downtown Chicago on Tuesday following the release of a video showing Jason Van Dyke, a police officer, shooting and killing Laquan McDonald. Van Dyke is charged with first-degree murder for the October 2014 shooting in which McDonald was hit with 16 bullets. So far this year, 15 officers have been charged with murder or manslaughter resulting from an on-duty shooting. Scott Olson/Getty Images hide caption

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"As far as I know ... there is no problem of over-incarceration for rich, white financial or environmental executives," defense lawyer Jeffrey Robinson of the American Civil Liberties Union said. Aleksandar Dancu/iStock hide caption

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