| 1886 | Haymarket Affair |
| 1892 | Homestead Strike |
| 1892 | Frick assassination attempt |
| 1894 | Pullman Strike |
| 1895 | Bliss arsenic poisoning |
| 1901 | William McKinley assassination |
| 1901 | Socialist Party of America established |
| 1905 | Steunenberg murder in Idaho |
| 1905 | Industrial Workers of the World (IWW) founded |
| 1910 | L.A. Times bombing |
| 1913 | Pacific Gas & Electric Strike |
| 1914 | World War I erupts |
| 1914 | Stockton, California, MM&E Strike |
| 1915 | Panama-Pacific Exposition |
| 1916 (July 22) | Preparedness Day bombing in San Francisco |
| 1916 | Chicago soup plot |
| 1916 (Dec.) | Billings conviction |
| 1917 (Feb.) | Mooney conviction |
| 1917 | United States declaration of war |
| 1917 | Espionage Act |
| 1917 | Red Scare begins |
| 1918 | Sedition Act |
| 1918 | Wilson Commission report released |
| 1932 | Wickersham Commission report released |
| 1939 | Tom Mooney released |