Freedom of assembly is enshrined in the US Bill of Rights. The freedom to communicate and publish info on our bitcoin ownership in the blockchain should be no different. Bitcoins are not "sent"; rather, ownership of slots is shifted in a ledger. The government has less interest in this than in what cash US dollars are used for and should clean up dangerous uses of the latter before they focus our tax dollars on the former.
“The monopoly of government of issuing money has not only deprived us of good money but has also deprived us of the only process by which we can find out what would be good money.” – Friedrich Hayek
To be determined!