<a href="https://en.wikipedia.org/wiki/Haymarket_affair" id="mwkQ" rel="mw:WikiLink" title="Haymarket affair">Haymarket affair</a>: In Chicago, United States, a <a href="https://en.wikipedia.org/wiki/Improvised_explosive_device" id="mwkg" rel="mw:WikiLink" title="Improvised explosive device">homemade bomb</a> is thrown at <a href="https://en.wikipedia.org/wiki/Chicago_Police_Department" id="mwkw" rel="mw:WikiLink" title="Chicago Police Department">police</a> officers trying to break up a labor rally, killing one officer. Ensuing gunfire leads to the deaths of a further seven officers and four civilians.<sup about="#mwt99" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-16"}}' id="cite_ref-16" rel="dc:references" typeof="mw:Extension/ref"><a href="./May_4#cite_note-16" id="mwlA" style="counter-reset: mw-Ref 16;"><span class="mw-reflink-text" id="mwlQ">[16]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-16"><cite about="#mwt96" class="citation book cs1" id="CITEREFGreen2006">Green, James R. (2006). <a class="external text" href="https://books.google.com/books?id=Fi74wSzZhk8C&amp;newbks=1&amp;newbks_redir=0&amp;printsec=frontcover#v=onepage&amp;q&amp;f=false" id="mwBjM" rel="mw:ExtLink nofollow"><i id="mwBjQ">Death in the Haymarket: A Story of Chicago, the First Labor Movement, and the Bombing That Divided Gilded Age America</i></a>. New York: Pantheon Books. pp.<span id="mwBjU" typeof="mw:Entity"> </span>5–8. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBjY" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBjc" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780375422379" id="mwBjg" rel="mw:WikiLink" title="Special:BookSources/9780375422379"><bdi id="mwBjk">9780375422379</bdi></a>.</cite><span about="#mwt96" class="Z3988" id="mwBjo" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Death+in+the+Haymarket%3A+A+Story+of+Chicago%2C+the+First+Labor+Movement%2C+and+the+Bombing+That+Divided+Gilded+Age+America&amp;rft.place=New+York&amp;rft.pages=5-8&amp;rft.pub=Pantheon+Books&amp;rft.date=2006&amp;rft.isbn=9780375422379&amp;rft.aulast=Green&amp;rft.aufirst=James+R.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DFi74wSzZhk8C%26newbks%3D1%26newbks_redir%3D0%26printsec%3Dfrontcover%23v%3Donepage%26q%26f%3Dfalse&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMay+4"></span></span>