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. ”
