The International Conference of Rome for the Social Defense Against Anarchists was held between 24 November and 21 December 1898 following the assassination of Empress Elisabeth of Austria by Luigi Lucheni on the promenade of Lake Geneva on 10 September 1898. Fifty-four delegates attended from 21 countries. Every participating government agreed to set up special organizations for the surveillance of those suspected of anarchism, defined as "any act that used violent means to destroy the organization of society."