The US has reportedly opened a criminal probe into market manipulation of bitcoin and other cryptocurrencies
"The US Justice Department and the CFTC are investigating spoofing and wash trading in cryptocurrency markets, according to Bloomberg. These are forms of market manipulation designed to influence the price of assets. They are illegal in mainstream financial ma…" - Oscar Williams-Grut
You also can go to this link and check it out: https://www.businessinsider.com.au/us-justice-department-bitcoin-crypto-market-manipulation-probe-2018-5
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