“Up to 80% of spam targetted at Internet users in North America and Europe is generated by a hard-core group of around 200 known professional spam gangs whose names, aliases and operations are documented in Spamhaus’ Register Of Known Spam Operations (ROKSO) database. This TOP 10 chart of ROKSO-listed spammers is based on those Spamhaus views as the highest threat, the worst of the career spammers causing the most damage on the Internet currently. Spamhaus flags these as a priority for Law Enforcement Agencies.”