From the "let's make up a problem and let the government fix it" files:
Reason on "one of the stranger (yet more persistent) myths of our time: the idea that some Lost Tribe of Gypsy Harlots, tens of thousands strong, wanders about the world from mega-event to mega-event, unimpeded by the usual logistics of transport and lodging which should make the migration of such a large group a daunting task indeed."
The legend seems to have first appeared in conjunction with the 2004 Olympics in Athens. That’s telling because, though the rebranding of sex work as "sex trafficking" was already underway in prohibitionist circles in the late 1990s, the moral panic seems to have begun in earnest in January of 2004. In the months before the Olympics Athenian officials went through the usual cleansing procedure, raiding brothels for largely bogus violations of zoning restrictions. A Greek sex workers’ union complained that by making it difficult to work in legal brothels the city would increase illegal prostitution, and this was twisted by European prohibitionists into "Athens is encouraging sex tourism."
By the end of the year, the growing “anti-trafficking” movement was using bad stats to claim that “sex trafficking increased by 95 percent during the Olympics.” Within a few months, anti-sex worker groups made the bizarre prediction that approximately 40,000 women would be “trafficked” into Germany for the 2006 FIFA World Cup. Of course, nothing of the kind happened. Despite increased police actions (including raids on 71 brothels), the German authorities only came up with five cases of exploitation they believed to be linked to the event.