Langhard provides a detailed account of the activities of anarchists within the International Workers' Movement starting from the 1840s in Switzerland. He discusses their agitation, congresses, and conferences, presenting their political programs and propaganda, often quoting from letters. Central figures include prominent individuals such as Michael Bakunin, Peter Kropotkin, and Johann Most, as well as criminals like Anton Kammerer, Hermann Stellmacher, and the assassin of Empress Elisabeth of Austria, Luigi Lucheni. The author also describes the judicial investigations, criminal prosecutions, and legislative measures in Switzerland. This is a reprint of the second edition from 1909.