Two labor leaders are framed for the worst terrorist act in San Francisco history. They spend 23 years in prison for the parade bombing that kills 10 and wounds 40.  Learn more about your ad choices. Visit <a href="https://megaphone.fm/adchoices">megaphone.fm/adchoices</a>

Two labor leaders are framed for the worst terrorist act in San Francisco history. They spend 23 years in prison for the parade bombing that kills 10 and wounds 40. Learn more about your ad choices. Visit megaphone.fm/adchoices

Two labor leaders are framed for the worst terrorist act in San Francisco history. They spend 23 years in prison for the parade bombing that kills 10 and wounds 40.&nbsp; Learn more about your ad choices. Visit <a href="https://megaphone.fm/adchoices" rel="noopener noreferrer">megaphone.fm/adchoices</a>

1916: Preparedness Day Bombing

On hiatus as of March 2020 because of the coronavirus crisis. Get unlimited access to the Chronicle. | A daily celebration of the news — and the news media — of years gone by. King Kaufman takes you on a quick tour of the Bay Area and the world as it used to be, which often colors the world of your century.

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1916: Preparedness Day Bombing

1916: Preparedness Day Bombing

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