Welch v. United States

After Welch (defendant) was sentenced under the Armed Career Criminal Act's residual clause enhancing sentences for prior violent felonies, the Supreme Court in Johnson held that clause void for vagueness; Welch then sought collateral relief arguing Johnson should apply retroactively to his earlier sentence, a position the government (plaintiff) agreed with, but the district court and court of appeals denied relief, and the Supreme Court granted certiorari.