I used to read a lot about Michele Sindona who was supposed to be connected to the Mafia and the intelligence community. His currency trading firm was one of the first to trade the Eurodollar contracts back in the 60s, IIRC.

I think intelligence and finance really go hand in hand. It makes so much sense -- you see, the intelligence community really hates the congress or whatever to snoop around its operations before approving the budget -- wouldn't it a lot easier to just earn your own $$? And with all the information the intelligence agencies control, it is almost trivial to make quick money in finance. Last but not the least, wouldn't banker be the perfect cover for spies? They wear nice suites, too.