February 12, 2012
By Timothy Messer-Kruse

For the past 10 years I've immersed myself in the details of one of the most famous events in American labor history, the Haymarket riot and trial of 1886. Along the way I've written two books and a couple of articles about the episode. In some circles that affords me a presumption of expertise on the subject. Not, however, on Wikipedia.

The bomb thrown during an anarchist rally in Chicago sparked America's first Red Scare, a high-profile show trial, and a worldwide clemency movement for the seven condemned men. Today the martyrs' graves are a national historic site, the location of the bombing is marked by a public sculpture, and the event is recounted in most American history textbooks. Its Wikipedia entry is detailed and elaborate.

A couple of years ago, on a slow day at the office, I decided to experiment with editing one particularly misleading assertion chiseled into the Wikipedia article. The description of the trial stated, "The prosecution, led by Julius Grinnell, did not offer evidence connecting any of the defendants with the bombing. ... "

Coincidentally, that is the claim that initially hooked me on the topic. In 2001 I was teaching a labor-history course, and our textbook contained nearly the same wording that appeared on Wikipedia. One of my students raised her hand: "If the trial went on for six weeks and no evidence was presented, what did they talk about all those days?" I've been working to answer her question ever since.

More: http://chronicle.com/article/The-Undue-Weight-of-Truth-on/130704/