On April 2[76][77] associations, political parties[77] and hundreds of pacifists demonstrated at Piazza Navona in Rome to protest against the NATO intervention. The protesters quoted from Nelson Mandela, Bertolt Brecht and Albert Einstein,[76][78] displayed a banner reading "humanitarian wars do not exist", and waved rainbow-colored anti-war flags. Organizers of the protest rally included Emergency, an NGO founded by Gino Strada.[79][80][81] The demonstration was attended by musicians such as Andrea Rivers, Assalti Frontali and Frankie Hi-Nrg mc.[77]