Google gets 7 hits (not including this question!) for the search: 1913 Portland free speech fight "Mary Schwab", including Portland Radical History Tour. This site says: "This is for you to take to the library or the Historical Society or to the City Archives and spend hours finding details...". The links specifically to Mary Schwab (www.fresnoalliance.com/IWW/analysis.htm) and the 1913 Free Speech Fight (www.fresnoalliance.com/IWW/analysis.htm) are broken, but their names, places and dates can give you hints for more searches. IWW portland "free speech fight" site:edu gets 36; IWW portland "free speech fight" 1913 gets 240, etc.
Pursuing those "Historical Society" and "City Archives" leads, the Oregon Historical Society gets no hits for: mary schwab in its catalog, and their links to other sources such as Northwest Digital Archives also get no hits for Mary Schwab as a phrase. The Portland City Archives may be a bit of a project to access - see Using the City of Portland’s Archives (Historical Collection) for some not very detailed information.