One source of victims for human traffickers are the people who want to emigrate from their country, but have no legal or financial means to do so. They look for work abroad, and often see an ad, or even learn through the word of mouth, about a promising job opportunity in a richer country, with little qualification required. It may be sex work, but also physical labour, such as construction.

If they agree, they have to rely on their would-be employers to move them to the destination, whereby their passport or other documents ends up in employers' hands "for  safekeeping". After that point, the victim is in a foreign country on illegal basis and without an ID or much money, becoming dependent on their "employer" and afraid to seek help from police. Some victims are actually hidden inside the employers' premises by force, others may just be severely underpaid, and yet others may actually enjoy their career until they want a raise or somehow cross the employer. 

As long as there is a tremendous income difference between countries, there will be labor migration. You can try and stop the migration itself, or try to create more legal options for it, thus bringing the workers into daylight and out of the mob's influence. Unfortunately, the most developed countries often accept only high-qualified labor immigrants; others are left to apply for "asylum" and await their verdict in overcrowded migration centers for months or years, without legal right to work.
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