Here you can find a list of authorities and organizations devoted to investigate and shut down scammers, scams and fraudolent activities.
You can also file a complaint here at FTA, if it is about a website or an auctioneer: File a Complaint.

Type of Authority	Description
Uk Police	Here you can find any police station in the UK, for reporting fraudolent activities.
Usa Cops	Find your nearest police station in the United States.
Canadian Police	Find any police station in Canada if you need to report any fraudolent activity in that region.
Australian Local Police	All the local police stations for reporting fraudolent activities.
Peru - Ministry of Justice	Peru - Ministry of Justice. Website is in Spanish.
Austrian Gendarmerie	Official site for the Austrian Police. Website is in German.
German Polizei	Official site for the German Police. Website is in German.
Italian Polizia	Official site for the Italian Police. Website is in Italian.
French Police	Find any police station in France. Website is in French.