You can find a list of USCIS designated regional centers in Washington on the USCIS website. Be careful when reading anyone's recommendations online. EB-5 requires investors to conduct a lot of due diligence. All regional center projects must be "at-risk" and past performance does not guarantee future success.
There are cases of fraud. You can easily find some of them by googling "EB-5 fraud". Vermont's Jay Peak is one example that's in the news. That's why it's so important for investors to conduct due diligence at every step of the process.