The ''Polizia di Stato'' are a civil police supervised by the Interior Ministry, while the ''Carabinieri'' is a gendarmerie supervised by the Defense Ministry; both share duties in law enforcement and the maintenance of public order. Within the Carabinieri is a unit devoted to combating environmental crime. The ''Guardia di Finanza'' is responsible for combating financial crime and white-collar crime, as well as customs. The ''Polizia Penitenziaria'' are responsible for guarding the prison system. The Corpo Forestale dello Stato (State Forestry Corps) formerly existed as a separate national park ranger agency, but was merged into the Carabinieri in 2016. Although policing in Italy is primarily provided on a national basis, there also exists ''Polizia Provinciale'' (provincial police) and ''Polizia Municipale'' (municipal police).