Since 2003 FC Barcelona hooligans, the Boixos Nois, are not allowed to enter in Camp Nou. The hardcore Barcelona hooligans subgroups were involved in police operations against organized crime. In 2008, after a hooligan incident versus Espanyol, FC Barcelona very publicly took a stand on violence, saying it hoped to stamp out violence for good. In 2007 Atlético Madrid hooligans clashed with Aberdeen FC hooligans prior to a UEFA Cup match. In 2009 and 2010 Atlético Madrid hooligans also clashed with FC Porto and Sporting Clube de Portugal in Portugal during UEFA Cup games. In 2012 a Rayo Vallecano hooligan was arrested during riots in the 14 November general strike and accused of terrorism. In 2014, debate about eradicating Spanish hooligans arose after Frente Atlético members murdered a Riazor Blues member, Deportivo La Coruña radicals; and after members of the Boixos Nois stabbed two PSG supporters in Barcelona. In 2016, football-related violence came once again to the public debate after a fight between Sevilla FC and Juventus FC supporters that occurred the day before their UEFA Champions League group stage match. Two Juventus supporters were stabbed (one of them was seriously injured but survived after being hospitalized) and a Sevilla supporter was hospitalized with head wounds caused by a glass bottle. Hooliganism began in Sweden in the early 20th century among fans of AIK, Hammarby and Djurgården who clashed after derbies in Stockholm. Modern hooliganism began in 1970 when fans of IFK Göteborg invaded the pitch, destroyed the goalposts and fought the police at the end of a match that relegated Göteborg from the Allsvenskan. Hooliganism in Sweden became a growing problem in the 1980s, but pitch invasions and violence at football grounds decreased in the late 1990s; when hooligan firms started pre-arranging their fights away from the grounds and the regular supporters. Seven clubs that have large organised hooligans firms are AIK (Firman Boys), IFK Göteborg (Wisemen) Djurgårdens IF (DFG) Hammarby IF (KGB) Malmö FF (True Rockers) GAIS (Gärningsmännen) and Helsingborgs IF (Frontline). But several other football, bandy and ice hockey clubs have active hooligan followings.