Otherwise you might be able to get a Swiss bank acct, set up an offshore investment trust in some tax haven like the caymans (invest everything for awhile), transfer the money to a third country and then to a US bank. Another way would be to open up a quickie-mart/nail salon/hotdog stand and over-report income - this is what criminals do.
If you are an actual criminal with $billions then you could just talk to one of the big banks like Wells Fargo (which absorbed Wachovia) and ask them to launder it for you. So the government has already made criminals of anyone that decides to cash out large chunks of btc and bring the cash home.