Castle Bank & Trust was a Bahamian bank that was involved in tax evasion, as well as covertly funneling funds for the Central Intelligence Agency. The bank was founded in the 1960s by Paul Helliwell, a former member of the Office of Strategic Services, and Burton Kanter, a tax lawyer.
The bank was used by the CIA to funnel money for covert military operations, including those at Andros Island (Bahamas), a staging area for anti-Castro activities.
The bank had many clients, including celebrities, organized crime figures and wealthy business owners. Some of the most notable included John Fogerty and other members of Creedence Clearwater Revival, who lost most of their wealth when the bank collapsed, Tony Curtis, Hugh Hefner, Penthouse (magazine), the daughter of Chiang Kai-shek, and members of the Pritzker family (owners of the Hyatt hotel chain). Reputed organized crime members that were customers included Moe Dalitz, Morris Kleinman, and Samuel A. Tucker.
In the early 1970s, the U.S. Internal Revenue Service started an investigation into the tax avoidance schemes used by the bank. The investigation was called Operation Tradewinds. The IRS was able to secretly photograph a list of the bank's clients, while a bank executive was dining in Miami with an IRS informant. As a result of this information, the IRS planned to initiate a new investigation, called Project Haven, into the tax affairs of the people on the client list. A prosecution of one of those clients eventually reached the United States Supreme Court as United States v. Payner.
However, the investigation was later dropped because of pressure from the CIA (according to the Wall Street Journal). The bank collapsed in 1977. The CIA then used Nugan Hand Bank for funding some of their covert activities, as they had done with Castle Bank & Trust.
Burton Kanter was tried, but acquitted in 1977 in a case involving tax evasion on the sale of a Reno, Nevada hotel using an account at Castle Bank & Trust. However, his law partner, Roger Baskes, was convicted in the case.