Protestors paint a 99% slogan on the street during May Day demonstrations in San Francisco
Protestors paint a 99% slogan on the street during May Day demonstrations in San Francisco, California in this May 1, 2012 file photograph.
Thousands of protesters marched through downtown Chicago on Sunday in one of the city's largest demonstrations in years, airing grievances about war, climate change and a range of other complaints as world leaders assembled for a NATO summit.