FINCEN: Financial Crimes Enforcement Network
Division of the United States Department of Treasury
FinCEN’s mission is to enhance U.S. national security, deter and detect criminal activity, and safeguard financial systems from abuse by promoting transparency in the U.S. and international financial systems.
http://www.fincen.gov/statutes_regs/ChapterX/
http://www.fincen.gov/forms/files/fin104_ctr.pdf
http://www.fincen.gov/