U.S. Olympians Tommie Smith, center, and John Carlos raise their fists in protest during the U.S. national anthem, which was being played after Smith won the 200 meters at the 1968 Summer Olympics in Mexico City.
A photograph depicting the rioting in Newark, NJ by residents, following the arrest of a black cab driver, John W. Smith, by two Newark policemen, John DeSimone and Vito Pontrelli in the summer of 1967.
Don Hogan Charles—Collection of the Smithsonian National Museum of African American History and Culture copyright Don Hogan Charles/The New York Times/Redux
Alabama Fire Department aims high-pressure water hoses at civil rights demonstrators, May 1963.
Charles Moore—Collection of the Smithsonian National Museum
[Photo credit: Wikimedia Commons.]