Social Democratic Federation of Massachusetts

Sources

• Hall-Hoag Collection of Dissenting and Extremist Printed Propaganda
• Wikipedia: http://en.wikipedia.org/wiki/Social_Democratic_Federation_(U.S.)
• Web: http://www.marxisthistory.org/subject/usa/eam/socialdemocraticfed.html
• DbPedia: http://dbpedia.org/page/Social_Democratic_Federation_(U.S.)