Subscribe | UPI Odd Newsletter Subscribe MILAN, Italy, Dec. 14 (UPI) -- An Italian woman who kissed a police officer at a protest in November has been charged with sexual violence, officials said. Nina De Chiffre, 20, of Milan, was at the protest against controversial plans for a new high-speed TAV train line in November when she kissed riot officer Salvatore Piccione's helmet, TheLocal.it reported. Advertisement "I wanted to make fun of them [the police], and I would say that we were successful," De Chiffre told La Stampa. Now, De Chiffre is facing charges of sexual violence and offense to a public official. Franco Maccari, the secretary-general of the COISP police union, told Radio24 that if the police officer had kissed a protester, "World War Three would have broken out." "We're tired of taking blows from the No TAV group -- and not just from them. Today, protesting is a sacred right, but when they overstep the line of legality, there can be no flexibility," Maccari said. Meanwhile, Piccione said: "When I'm wearing my uniform I represent the police institution, and I have an obligation not to react to provocation. The important thing is that, in the end, the demonstration went ahead without disturbance." Advertisement Read More 'Pitchfork' protests spread across Italy in advance of confidence vote Protest over housing hardship turns violent in Rome; 16 injured Police clash with protesters in Rome Protests, transit strike disrupt life in Rome