The Justice Department is investigating crypto market manipulation — here's why it's such a big problem
http://www.businessinsider.com/why-cryptocurrencies-are-susceptible-to-market-manipulation-2018-5?op=1
cryptocurrencies
U.S. Launches Criminal Probe into Bitcoin Price Manipulation
https://www.bloomberg.com/news/articles/2018-05-24/bitcoin-manipulation-is-said-to-be-focus-of-u-s-criminal-probe