There is a fascinating web site put up by the consortium of journalists working with the Mossack Fonseca papers. The home page is at panamapapers.icij.org with a signup page for new updates. The files they have go back 40 years, and the information contained in them has already led to the resignation of the Prime Minister of Iceland and yet one more FIFA scandal/resignation/set of police raids.
The law firm was quite happy to assist big-time thieves (helping launder the proceeds of the $200 Heathrow Airport gold heist), jailed sex offenders and political leaders. Their papers open a window into the web of banks and other players in the big-buck game of foreign shell companies that allow money laundering and tax evasion, as well as merely hiding wealth from public scrutiny, which is not illegal. The data includes 210,000 companies, many open only briefly. Wealth management is a big business, and top European banks are active in this area. Prominent among them are the private bank arms of HSBC (the Hong Kong Shanghai Bank Corporation).