The Masses was a progressive journal of Greenwich Village that was published between 1911 and 1917. The journal covered important issues of the day including women's suffrage, unionization, birth control, and racial equality. You can find many of the most prominent activists and thinkers of the age published within its pages including many of the people that populate your reacting to the past game. You can find pdfs of complete issues here:
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Sample Articles from November 1913 Issue: