Typically the bankers are also often in on this.
Eg. during India's infamous demonetization, it was rumored that lots of bank-managers had struck inside-deals with politicians/industrialists to turn large hordes of cash into 'white' money. It's likely that they also used the new low-overhead 'jan-dhan' accounts to turn cash into thousands of bank-deposits.
This is not just the 'developing-world' issue; the whole of UK economy is based on such scheming done everyday in the City (and the 'out-of-jurisdiction' isles of the Commonwealth).