time, the Curva Sud of the Stadio Olimpico has been controlled by more right-wing groups, including A.S. Roma Ultras, Boys and Giovinezza, among others. However, the oldest group, Fedayn, is apolitical, and politics is not the main identity of Roma, just a part of their overall identity. Besides ultras groups, it is believed Roma fans support the left as opposed to Lazio supporters, which are notoriously proud of their right-wing affiliation. In November 2015, Roma's ultras and their Lazio counterparts boycotted Roma's 1–0 victory in the Derby della Capitale in protest at new safety measures imposed at the Stadio Olimpico. The measures – imposed by Rome's prefect, Franco Gabrielli – had involved plastic glass dividing walls being installed in both the Curva Sud and Curva Nord, splitting the sections behind each goal in two. Both sets of ultras continued their protests for the rest of the season, including during Roma's 4–1 victory in the return fixture. Lazio's ultras returned to the Curva Nord for Roma's 1–4 victory in December 2016, but the Roma ultras continue to boycott matches. The most known club anthem is "Roma (non-si discute, si ama)", also known as "Roma Roma", by singer Antonello Venditti. The title roughly means, "Roma is not to be questioned, it is to be loved," and it is sung before each match. The song "Grazie Roma", by the same singer, is played at the end of victorious home matches. Recently, the main riff of The White Stripes' song "Seven Nation Army" has also become widely popular at matches. Rivalries In Italian football, Roma is a club with many rivalries; first and foremost is their rivalry with Lazio, the club with whom they share the Stadio Olimpico. The derby between the two is called the Derby della Capitale, it is amongst the most heated and emotional footballing rivalries in the world. The fixture has seen some occasional instances of violence in the past, including the death of Lazio fan Vincenzo Paparelli in 1979–80 as a result of an emergency flare fired from the Curva Sud, and the abandonment of a match in March 2004 following unfounded rumours of a fatality which led to violence outside the stadium. Against Napoli, Roma also compete in the Derby del Sole, meaning the "Derby of the Sun". Nowadays, fans also consider other Juventus (a rivalry born especially in the 1980s), Milan, Atalanta (since 1984, when friendly relations