- Chicago Anarchists on Trial
 - Collection which showcases original manuscripts, broadsides, photographs, prints, and artifacts relating to the Haymarket Affair. From the American Memory project at the Library of Congress. - Haymarket Tragedy, The
- From the Illinois Labour History Society.
- Haymarket Martyrs, The
- From the Illinois Labour History Society.
- Chicago: 1886 The Haymarket Riot
- From the Chicago Public Library
- Haymarket Affair
- Concerning the riot and subsequent trial.
- Address of August Spies
- One of many pro-labour speeches given prior to the riot.
- The Dramas of Haymarket
- In five acts, with historic photographs and illustrations.
- Wikipedia: Haymarket Riot
- User-generated article about the Haymarket Riot on May 4, 1886 in Chicago, Illinois, a landmark in U.S. labour history.
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