New Delhi, Feb. 12 -- One recent night, Youga was grateful when he finally slept in a bed, even though it had neither pillow nor blanket.

For two days, the African man said, he slept on the street after he reached Cambodia's capital, Phnom Penh, following his escape from a scam compound in O'Smach, which borders Thailand in the north. He had only $100 left to his name and wanted to save the money. So the Caritas shelter took him in.

The shelter, the only one of its kind that helps victims escaping from scam compounds, was funded previously by the United States. Today, it is stretched at the seams, working with a third of the staff and a fraction of the budget it previously had as the country faces an unprecedented surge of workers leavi...