The Class Action Fairness Act [CAFA; 28 U.S.C. § 1332(d); Pub. L. No. 109-2, 119 Stat.4 (2005)] authorizes the removal to federal court of “mass actions,” in which “monetary relief claims of 100 or more persons are proposed to be tried jointly on the ground that the plaintiffs’ claims involve common questions of law or […]