In the Fall 2012 issue of The Journal of Art Crime, columnist Noah Charney writes on "Counterfeit Money" in Lessons from the History of Art Crime:

In this, and the last, issue of The Journal of Art Crime, we have seen excellent academic articles on aspects of counterfeit money (see Mihm, Stephen in the Spring 2012 issue, and Judson and Porter in this issue).  While counterfeit money is its own field of study, it has many parallels with art forgery, and we therefore have seen fit to consider it in this journal.  In doing so, I thought that it might be of interest to present a brief history of counterfeit money, for those unfamiliar with the subject. 

Perhaps the most well-known sort of forgery is the faking of money, whether counterfeiting coins, dollar bills, or treasury bonds.  The United States Secret Service, before they became best-known as the bodyguards of the president, were established in order to investigate counterfeit money printing operations and close them down.