It's only a recent proposal in the US, not law, if you're talking about what I think you are:

https://torrentfreak.com/u-s-know-your-customer-proposal-wil...

>>> Late January, the U.S. Department of Commerce published a notice of proposed rulemaking for establishing new requirements for Infrastructure as a Service providers (IaaS) . The proposal boils down to a 'Know Your Customer' regime for companies operating cloud services...