Human trafficking became a public concern in the 1990s, mostly due to the collapse of the Soviet Union. The collapse resulted in migration flows and the increasing concern about the growth of transnational criminal organizations operating globally.
Intelligence discovered sex trafficking and forms of forced labor as some of these organizations' sources of profit. The first efforts to address trafficking in persons focused heavily on combating the sex trafficking of women and girls.
The typical definition for "severe forms of trafficking in persons" is: