The US Senate banking committee wrote a letter to facebook questioning about the nature and legality of it's cryptocurrency project code named Libra.
https://www.banking.senate.gov/imo/media/doc/5.9.19%20Facebook%20Letter.pdfThey essentially asked whether it would enable users to have privacy and would make it harder for the government to monitor every personal and financial moves of people in the US and around the world.
How it will be harder for the government to monitor personal and other moves blockchain all about transparency no were they mentioned they are going to introduce privacy coin or ananymous coin . Still people doesnt understand crypto currency and blockchain