From the article as it applies to Tor:
"Senators Charles Schumer (D, New York) and Joe Manchin (D, West
Virginia) have written to Attorney General Eric Holder and the DEA
asking that action be taken to crackdown on the Silk Road. Silk Road is
an online exchange that deals in drugs and Bitcoins. Since the Bitcoin
transactions are anonymous, and Silk Road is accessed through Tor,
authorities have no way to track down users buying drugs."
Original article here:
http://www.maximumpc.com/article/news/us_senators_seek_crackdown_bitcoin
A more verbose version here:
http://www.rawstory.com/rs/2011/06/09/senators-call-for-crackdown-on-bitcoin...
Since it appears they're going to be targeting a Hidden Service, it will
be an interesting test of Tor's resilience given the resources available
to the US government.
Take care,
Chris
--
Christopher A. Lindsey