Without Deloitte and PwC the US government would not be able to function. Accounting services are necessary for corporations to function. Without them, corporations performance is immeasurable and the entire financial system would collapse. Very significant number of corporations and governments rely on these companies to manage accounting and operations.

Just cuz you do not understand what they do, that does not mean it is money laundering. And who does money laundering in a business where all its revenue comes from large contracts and 90% of their expenses is salary. That is the dumbest money laundering concept ever.