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

The Fed is taking on a serious risk in doing this because these assets that it takes on in exchange for Treasury securities could fail.

美联储这样做很有风险,因为这些他们作为国库证券交换来的,资产可能是个烂摊子。

耶鲁公开课 - 金融市场课程节选