It has been pretty well-known that the Swiss will not keep secrets as they once did. There is plenty of money around now,and they feel they don't need to: besides, Switzerland is surrounded by the EC, and they can impose major sanctions. The Caymans, Bermuda, and perhaps one or more of the Gulf states might be a better place to hide your loot is you are a dictator. The Queen has oodles of money, At one time, she got more money from the US in ag price supports for not growing cotton than anyone else on the planet. She demonstrated a real talent for no growing cotton. In 20 years, not one boll got away from her.
Fidel is a sort of a mystery. I doubt that he has a lot squirreled away. Certainly not in the same league as Her Britannic Majesty.
