I'm not quite happy with "shenanigans" - to me, at least, it has the primary connotation of, as Merriam-Webster say in meaning 2.b: " high-spirited or mischievous activity —usually used in plural".
Part of the reason I like "swindle" here - which is very close to some of Phil's suggestions - is that I think it works well in the context of the phrase it's in:
"maestros internacionales de la trapisonda bursátil" --> "international masters of the stock-market swindle". And "swindle" is one of the meanings listed for "trapisonda" in diccionarioreverso.net.
Although I do like Neilmac's comment about the cacophony component that is conveyed by "shenanigans" - but, as I said above, I think that "shenanigans" has that connotation of a high-spirited or mischievous prank, whereas what we're looking at here was $170 million of vicious theft, that probably seriously hurt a lot of people. IMHO...