Since a CDO can have ANY kind of debt inside them, they can have a city, a county, or a countries's debt
( bonds) and bet against the debt being paid off.
They can, in effect, bankrupt the world.
Plus...this is getting so much better...one "group" of say, Goldman Sachs can make money by selling the bonds for the city, another "group" of GS can make money by packaging the CDOs, a 3rd "group"
can be GS Hedge fund people to bet against them.
I think I got that right, yes?
edit: add link
http://sacramentofordemocracy.org/?q=node/34883