that are so related to claims in the action within such original jurisdiction that they form part of the same case or controversy under Article III of the United States Constitution. Such supplemental jurisdiction shall include claims that involve the joinder or intervention of additional parties. 28 U.S.C. § 1367(a). Notably, the statute goes on to enumerate several specific exceptions to the general rule' — of which class action suits under Fed.R.Civ.P. 23 is not one. Subsection (b) provides: (b) In any civil action of which the district court .3d 524, 528 (5th Cir.1995) (Free v. Abbott Labs.) (same), aff'd by an equally divided court, 529 U.S. 333, 120 S.Ct. 1578, 146 L.Ed.2d 306 (2000) (per curiam), with Leonhardt v. Western Sugar Co., 160 F.3d 631 (10th Cir.1998) (Leonhardt ) (<HOLDING>). As the Second Circuit noted in Mehlenbacher,
holding that directly applicable supreme court decisions require this court to overrule its prior holdings holding that threejudge panel cannot disregard or overrule circuit precedent holding that  1367 does not overrule zahn holding that one panel cannot overrule a prior panels published decision holding that citizens united did not implicitly overrule beaumont