In 1916 , the Preparedness Day Bombing in San Francisco resulted in 50 people being killed or wounded ; Buda 's participation could be neither proved nor disproved . In 1917 , Buda met with ten other anarchists ( including his friend Carlo Valdinoci ) . A bomb was placed alongside the Italian Evangelical Mission Church in Milwaukee 's Third Ward ( 24 November ) . The device was discovered and brought to the police station where it detonated , causing the death of 9 policemen and two civilians . The bomb was thought to be an attempted retaliation for the killing of two Bay View Italians on 9 September 1917 during a hostile exchange between a group of local Italians and pro American patriotism pastor , Rev. August Giuliani , of the Italian Evangelical Mission Church . . The authorities , however , were never able to prove the guilt of the accused , because many of them were in prison at time of the bombing . As a response , anarchist bombings followed across the country ( on 2 June 1919 , bombs were set off in Paterson , New Jersey , Boston , Philadelphia , Cleveland , Pittsburgh and Washington , D.C. ) , although most did not create serious consequences . In this climate , the Immigration Act of 1918 was promulgated , by which foreigners who were involved or simply accused of subversive activities could be expelled . Many anarchists were repatriated to their countries of origin because of this law
Preparedness Day Bombing
Preparedness Day Bombing
Mario Buda