Welcome to Supreme Court Brief and a rare May argument day. The justices this morning wrap up the term’s arguments with a sentencing challenge involving the First Step Act of 2018. After a change in the government’s position by the Biden administration, the court appointed former Thomas clerk Adam Mortara to defend the lower court judgment. Plus: a team of scholars has transcribed the “black book” of the late Justice Oliver Wendell Holmes. A new voice will cry “Oyez, oyez” at the start of court proceedings, as a new marshal comes to town.

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