People shout slogans during a march commemorating the anniversary of the Tlatelolco Massacre in Mexico City, Monday Oct. 2, 2017. Mexico commemorated the 49th anniversary of the massacre where students and civilians were killed by the military and police on Oct. 2, 1968, a time known as the "Mexican Dirty War" when the government suppressed political opposition 10 days before the opening of the 1968 Summer Olympics in Mexico City.
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In the summer of 1968 anti-war protests swept Grant Park 50 years ago this week. 10,000 demonstrators descended on the Democratic National Convention.