The Federal Reserve has a list which you can find on their website of dealers who are eligible to participate in Treasury security auctions.

美联储有一个交易商的名单,你可以在他们网站上找到,其中的交易商有资格,参与国库证券的竞标。

耶鲁公开课 - 金融市场课程节选

It would also improve market liquidity for assets eligible as security for central-bank money, to the benefit of overall financial stability.

ECONOMIST: Economics focus

Dr. Jose Katz, of Closter, pleaded guilty Wednesday in federal court to conspiracy to commit health care fraud and an unrelated count of Social Security fraud for giving his wife a yearslong no-show job, making her eligible for Social Security.

WSJ: NY, NJ area cardiologist admits record $19M fraud

ITINs are basically the equivalent of Social Security numbers for those taxpayers who are not eligible for a Social Security number.

FORBES: In Effort to Curb Immigration Related Fraud, IRS Changes ITIN Procedures