The novel “The Gadfly”, written by the English writer E. -L. Voynich, is dedicated to the activities of the Italian underground organization “Young Italy” in the 30s and 40s of the 19th century. The writer exposes the deceit and hypocrisy of the ministers of the Catholic Church. The image of the main character of the novel, Gadfly, became an example of a revolutionary hero. Getting acquainted with the history of the struggle and death of the brave Gadfly, readers of many countries and generations learn heroism and courage.