Federal prosecutors are opposing the bid of a 98-year-old retired school teacher to have her record wiped clean of what she insists was an unjust 1950 conviction for obstructing the investigation of Soviet atomic spying.

Southern District Assistant U.S. Attorney Robert Allen argued in a memorandum of law submitted late Wednesday afternoon that Miriam Moskowitz is not entitled to a writ of error coram nobis—an “extraordinary remedy” granted only in “strictly limited circumstances.”