Assignment $14$

The assignment requires reference to a Shepard's cita$-$tor, in print or online. Regarding $18$ U$.$S$.$C$.1201(a),$ what is the citation of the United States Reports deci$-$sion that held the provision unconstitutional in part? What Sixth Circuit case found the provision constitutional? What Second Circuit case, in $2001,$ discussed section $1201($a$)(1)?$