Here's the abstract:
Despite the attention given to the issue of human trafficking, the empirical base for policy making remains problematic. During the 1920s, the League of Nations pioneered research into human trafficking with the first intercontinental study. Field work took place in 28 countries across Europe, the Americas, and the Mediterranean; researchers conducted 6,500 interviews in 14 languages. The fieldwork conducted in Canada, the first and last country to be studied, reveals a great deal about human trafficking research today. The researchers encountered problems familiar to current researchers and their official report contains many of the same conclusions. The discussion here explores the unreliability of statistical estimates, difficulties in researching hidden populations, the lack of cases meeting a legal standard, and claims about the involvement of organized crime. It concludes with comments about the importance of incorporating historical perspective into criminology.