1917 California Governor's Mansion bombing

The 1917 California Governor's Mansion bombing took place just before midnight on December 17, 1917 when about 25 sticks of dynamite exploded near the rear porch of the Governor's Mansion just blocks from the California State Capitol Building. == Background == Well known labor leader and suspected dynamitist, Thomas Mooney, was tried and convicted in 1916 for the Preparedness Day Bombing in San Francisco, which led to the death of ten and injury of forty more.

Source: Wikipedia — 1917 California Governor's Mansion bombing (CC BY-SA 4.0)