In general, the term "money laundering" refers to activity designed to hide, conceal or spend the proceeds of unlawful activity. Under federal statutes, 18 USC sec. 1956 and 1957, it is unlawful to conduct financial transactions with the proceeds of criminal activity for the purpose of promoting or carrying out that activity, and it is unlawful to engage in transactions designed to disguise or conceal those proceeds. Money laundering prosecutions are complex, and frequently involve multiple layers of financial transactions. During his time as federal prosecutor, Mr. McCabe investigated and prosecuted numerous money laundering cases, including international money laundering schemes involving the Colombian "black market peso exchange."