On May Day 1909, Argentinean police commanded by military officer Ramón Falcón massacred workers demonstrating in Buenos Aires.
In response, Simón Radowitzky, a Jewish Ukrainian anarchist, ended Falcón's life on this day—November 14—that same year.
Radowitzky went on to distinguish himself as a lifelong anarchist—organizing his fellow prisoners, carrying out a daring prison escape, fighting in the Spanish Civil War, rescuing the archives of the National Confederation of Labour (CNT) during the fascist takeover, and finally settling in Mexico, where he continued to organize and support other prisoners.
Also, notably, Radowitzky asserted his Jewish identity while opposing Zionist colonialism in Palestine.
As for Falcón, he is cheifly remembered as a murderer who got his just desserts.