http://www.treasury.gov/resource-center/terrorist-illicit-finance/Documents/FinCEN-Hawala-rpt.pdf http://www.treasury.gov/resource-center/terrorist-illicit-fi..

http://www.treasury.gov/resource-center/terrorist-illicit-finance/Documents/FinCEN-Hawala-rpt.pdf http://www.treasury.gov/resource-center/terrorist-illicit-fi... The first few pages are a very readable, understandable description of how the system works in layman's terms. Recommended read.