Brothers Ricardo Flores Magón and Enrique Flores Magón at Los Angeles Federal Court after being arrested on federal charges for their political activities. UCLA Charles E. Young Research Library Department of Special Collections hide caption
Lawrence Wu
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From 2011, at an Occupy DC protest in Washington. A man holds a sign and a ball and chain, representing his college loan debt. (AP Photo/Jacquelyn Martin) Jacquelyn Martin/ASSOCIATED PRESS hide caption
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The Three Mile Island nuclear power plant two days after a meltdown forced a temporary closure of the plant. Bettmann/Bettmann Archive hide caption
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The Black Panthers march in protest of the trial of co-founder Huey P. Newton in Oakland, California. Bettmann/Getty Images hide caption