<a class="mw-redirect" href="https://en.wikipedia.org/wiki/Memorial_Day_massacre_of_1937" id="mw6w" rel="mw:WikiLink" title="Memorial Day massacre of 1937">Memorial Day massacre</a>: Chicago police shoot and kill ten labor demonstrators.<sup about="#mwt54" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-8"}}' id="cite_ref-8" rel="dc:references" typeof="mw:Extension/ref"><a href="./May_30#cite_note-8" id="mw7A" style="counter-reset: mw-Ref 8;"><span class="mw-reflink-text" id="mw7Q">[8]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-8"><cite about="#mwt51" class="citation book cs1" id="CITEREFGrafSkorpad2002">Graf, John; Skorpad, Steve (2002). <a class="external text" href="https://books.google.com/books?id=2MnSgzx-iGsC&amp;pg=PA36" id="mwB7c" rel="mw:ExtLink nofollow"><i id="mwB7g">Chicago's Monuments, Markers, and Memorials</i></a>. Arcadia Publishing. p.<span id="mwB7k" typeof="mw:Entity"> </span>36. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB7o" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB7s" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-7385-2002-5" id="mwB7w" rel="mw:WikiLink" title="Special:BookSources/978-0-7385-2002-5"><bdi id="mwB70">978-0-7385-2002-5</bdi></a>.</cite><span about="#mwt51" class="Z3988" id="mwB74" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Chicago%27s+Monuments%2C+Markers%2C+and+Memorials&amp;rft.pages=36&amp;rft.pub=Arcadia+Publishing&amp;rft.date=2002&amp;rft.isbn=978-0-7385-2002-5&amp;rft.aulast=Graf&amp;rft.aufirst=John&amp;rft.au=Skorpad%2C+Steve&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D2MnSgzx-iGsC%26pg%3DPA36&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMay+30"></span></span>