He sells private sea shells by the seashore...
A somewhat dated article excerpt by Mother Jones. Seems to me that cleaning up a legal system that allows or fails to regulate this activity is the FIRST step toward preventing tax havens/evasion. Is this still going on? Probably.
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...The world's largest financial institutions are also growing richer by offering private banking services to their top clients. Big-time American players include Merrill Lynch, Chase Manhattan, J.P. Morgan, Morgan Stanley, and Goldman Sachs. The leading U.S. private banker is Citibank, which administers trusts and shell corporations for some 40,000 clients through its operations in New York, London, the Bahamas, the Cayman Islands, the Isle of Jersey, and Switzerland.
To open an account, private banking clients must generally deposit at least $1 million. According to a report by the Senate Permanent Subcommittee on Investigations, private bankers then assign the client a "relationship manager" who creates offshore trusts, handles all financial transactions -- and helps ensure secrecy. "Private banks routinely create shell companies and trusts to shield the identity of the beneficial owner of a bank account," the report states. "Private banks also open accounts under code names and will, when asked, refer to clients by code names or encode account transactions."
One former private banker who had more than 30 clients, each with as many as 15 shell companies, told the subcommittee that his own bank prohibited him from keeping any records linking front operations to their owners. In another case, Federal Reserve examiners asked Bankers Trust to create a database identifying the owners of shell companies. The bank complied -- by setting up the database on the Isle of Jersey in the English Channel, which requires U.S. investigators to request names on a case-by-case basis from Jersey courts. The effort to create and shelter multiple accounts "complicates regulatory oversight and law enforcement," the Senate subcommittee concluded, "making it nearly impossible for an outside reviewer to be sure that all private bank accounts belonging to an individual have been identified."
The secrecy makes it easy for clients of private banks to hide their wealth, whatever its source. Citibank's clients have included the family of Sani Abacha, the former Nigerian general who plundered billions of dollars from his nation's treasury, and dictator Omar Bongo of Gabon, for whom Citibank established a Bahamian shell corporation to stash his looted treasure. Citibank also helped Raul Salinas, brother of former Mexican president Carlos Salinas, by transferring tens of millions of dollars out of Mexico and depositing the money in European banks under the names of untraceable companies registered in the Cayman Islands. Citibank never used Salinas' name in bank communications, referring to him instead as "Confidential Client Number 2," or "CC-2."
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=114x46457