Foreigners who had been banking on their investments in a biomedical research facility and a hotel and rental cottage project in northern Vermont to get green cards are scrambling to find a backup now that the project’s developers are accused of misusing hundreds of millions of dollars of investors’ money in what investigators called a “massive eight-year fraud scheme.”

Wei Wang and his wife, who are from Beijing and living in Houston after graduate school, had hoped their investment of more than $500,000 would lead them down the road to starting a restaurant.