[...] if new rules proposed by the Financial Crimes Enforcement Network, or FinCEN, go into effect, the government will [know you transferred money] — along with your name, address, bank account number, and other sensitive financial information.

FinCEN, an agency component of the Department of the Treasury, proposed a set of rules (pdf) that would require banks and money transmitters to report to the government any cross-border electronic funds transfer.

FinCEN estimates it will receive 750 million reports every year, and the agency wants to keep the data for ten years. Once the reports are filed with FinCEN, other federal law enforcement agencies — the FBI, IRS, ICE, and the DEA — would all have access to the data.

EFF Release:
  http://www.eff.org/deeplinks/2010/12/sending-money-overseas-holidays-government-wants

EFF Comments / Response to Director Freis (PDF):
  https://www.eff.org/files/EFF%20Comment_Cross-Border%20Transmittal%20of%20Funds.pdf

Rules proposed by FinCEN (PDF):
  http://edocket.access.gpo.gov/2010/pdf/2010-24417.pdf

Submit Your Comments:
  http://www.regulations.gov/#!submitComment;D=FINCEN-2010-0002-0001

Donate to EFF with Bitcoin:  https://www.eff.org/helpout

They always need MOAR power to solve crime! Of course, all that does is change the criminal's method of "money laundering".