As I've called people's attention to, in here, before
(https://trisquel.info/en/forum/how-use-tor-trisquel#comment-26792), it was
the US government itself who created the "Tor" network.
(So, it's no surprise - to me, at least - that it's a network that can be
hacked by that same US government.)
But, now that you mentioned the "Silk Road" trafficking network... You made
me realize something that I had not "connected the dots" about before.
It's the CIA, mostly, who runs the international drug trade
(http://www.youtube.com/watch?v=292r5W-nSVU). So, being "Tor" a
government-created network and the "Silk Road" a part of that same network...
You might be just right about the latter... It's most probably a CIA-created
network. :)