Crypto Exchanges
https://bitfinex.com/?refcode=RRhJ9kg3
Global crypto exchanges vary in legal identification requirements, depending upon their national sovereignty venue. "know your customer", KYC, can be quite invasive. Some exchanges do not require it, if you are not transfering fiat currency.
Anyone in the US will have problems with the Federal Government no matter where they do business. The easiest way to mitigate the issue is to make the connect through Virtual Private Networks, VPN, and avoid wire transfers. I have been able to conduct small transactions on my cell phone in person on the street. If you have enough cash to warrant transactions over US$10K, take a plane flight to a more friendly venue and only handle personal wallets in the US. Do not carry memory sticks with crypto data through US customs. They will copy it, which could become a legal problem for you. Email sensitive data and access it once you are on location.
My favorite exchange due to the least hassles is Bitfinex.
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https://bitfinex.com/?refcode=RRhJ9kg3