Protesters light a dumpster on fire, early Monday in Berkeley, Calif., as raucous demonstrations hit the streets of California for a second straight night in response to police killings in Missouri and New York. Taylor Nitta/AP hide caption

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A man carries a box of merchandise from a vandalized Radio Shack on Sunday during a march against the New York City grand jury decision to not indict a police officer in the death of Eric Garner, in Berkeley, Calif. Stephen Lam/Reuters/Landov hide caption

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A police officer in Ferguson, Mo., stands guard as protests turned violent following Monday night's announcement of the grand jury's decision not to indict police officer Darren Wilson in the shooting death of 18-year-old Michael Brown. David Goldman/AP hide caption

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Communist party lawmaker Liana Kanelli enters her car after protesters threw yogurt on her face as she tried to reach the Greek parliament during a 48-hour general strike in Athens in 2011. STR/AFP/Getty Images hide caption

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