<a href="https://en.wikipedia.org/wiki/Saint_Valentine%27s_Day_Massacre" class="extiw" title="en:Saint Valentine's Day Massacre">Saint Valentine's Day Massacre</a> brick displayed at the <a href="https://en.wikipedia.org/wiki/National_Museum_of_Crime_%26_Punishment" class="extiw" title="en:National Museum of Crime &amp; Punishment">National Museum of Crime &amp; Punishment</a>, Washington, D.C.
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<p><b>The St. Valentine's Day Massacre</b>
</p><p>This bullet-impacted brick was the first to be removed from the Massacre site prior to its demolition. Note the circular markings, made by the <a href="https://en.wikipedia.org/wiki/Chicago_Police_Department" class="extiw" title="en:Chicago Police Department">Chicago Police Department</a> ballistics detectives in their investigations to determine how many gunmen were likely to have participated in the Massacre, and what weapons were used.
</p><p><small>The St. Valentine's Day Massacre was the name given to the Winter 1929 machine-gun slaying of seven men in a Prohibition-Era conflict between the two most powerful Chicago gangs: the South Side Italian squad led by <a href="https://en.wikipedia.org/wiki/Al_Capone" class="extiw" title="en:Al Capone">Al "Scarface" Capone</a> and the North Side Irish/German gang led by <a href="https://en.wikipedia.org/wiki/Bugs_Moran" class="extiw" title="en:Bugs Moran">George "Bugs" Moran</a>.
</small></p><p><small>Courtesy of the Arthur Nash Collection</small>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/65193799@N00">David</a> from Washington, DC
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bootbearwdc/2868502113/">_MG_5827</a>