There were some rumors that Chinese nationals were using bitcoin, especially on the Mt.Gox exchange to get around capital controls and expatriate funds. Nothing but a rumor, but has a whiff of plausibility to it that speculation about the Fed does not.
I don’t think it is necessarily the U.S. it could be any nation state. Could be international bankers. Soros. I can speculate. Russian Mafia is the Russian State.