http://www.cftc.gov/PressRoom/PressReleases/pr7675-18#PrRoWM...
http://www.cftc.gov/PressRoom/PressReleases/pr7674-18#PrRoWM...
Second fraud is very common on bitcointalk. Many people who have gotten rich off bitcoin or other cryptocurrencies don't know how to spread their risk. They are not exactly investment savvy. So they routinely fall for fraudsters claiming to be expert investors. These fraudsters solicit coins to be converted to fiat and then invested in real estate or some other commodity.
This obviously is a bad idea because if you give say 1 BTC @ 10k USD, two things can happen:
a. BTC price increases to 15k USD. Now the fraudster needs to pay back 50% more in USD. So, the fraudsters routinely come back claiming the investment was a bust or they got hacked.
b. BTC price decreases to 8k USD. Now fraudsters need to pay 20% less. So they will come back claiming some family emergency and paying back all outstanding BTC obligations.
And I have tried explaining it to people on the forum only to be drowned with "This is FUD" posts.