Summary

Byron White United States v. Pioneer American Insurance Company…

The Court has never held that mortgagees face a less demanding test of perfection than other interests when competing with the federal lien. Indeed United States v. R. F. Ball Constr. Co., 355 U.S. 587, 78 S.Ct. 442, 2 L.Ed.2d 510, stands for just the contrary. There the state law creditor, asserting that the assignment under which he claimed was a mortgage within the predecessor to § 6323, insisted upon priority over the federal lien by virtue of the previously executed assignment.
Source: Wikisource

Byron White United States v. Pioneer American Insurance Company…

For example, when a broker purchases a security for his customer on the exchange, it is obviously impossible for him to check all the offices in which a notice of the tax lien may be duly filed to determine whether the security is subject to such lien. A like situation exists with respect to over-the-counter and direct transactions in securities.
Source: Wikisource

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