This book is the first in-depth view of the banknote industry and its modus operandi. The only known former attempt to reveal this story was by an American author. The edition of that book was bought up – straight from the printing presses – by two prominent representatives of the industry because the public was not supposed to get an inside view of the business.

Moneymakers has been researched over a five-year period in Europe, the USA and Latin America. The book is based exclusively on personal interviews and confidential material normally not accessible to outsiders. There were attempts to stop this research project. Many witnesses interviewed spoke under condition of strict confidentiality for fear of reprisals by their employers. As a rule therefore, the author refrained from verbatim quotes and, as far as possible, tried to confirm every piece of information by two independent sources.

He's probably referring to Murray Teigh Bloom and the Brotherhood of Money. Murray was able to get close to salesmen and others connected with bank note companies and revealed or exposed some inside information.