- 1367(a): Supplemental jurisdiction over all other claims 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 - Supplemental jurisdiction is granted if the claims arise from a common nucleus of operative facts (Gibbs) - 1367(b): No supplemental jurisdiction over claims by PLAINTIFFS against person made parties under Rule 14, 19, 20, or 24; or by persons joining as plaintiffs under rule 19 or 24