President Biden on Monday commuted the sentences of nearly all prisoners on federal death row, sparing the lives of 37 men just a month before Donald J. Trump will return to the Oval Office with a promise to restart federal executions. Those affected by Mr. Biden’s action, all of whom were convicted of murder, will serve life imprisonment without the possibility of parole instead of facing execution. Only three men, who each carried out notorious mass killings, will remain on federal death...