To a hammer, everything looks like a nail. And to a Court bent on diminishing the usefulness of Rule 23, everything looks like a class action, ready to be dismantled.
-Justice Kagan, dissenting today in Amex v. Italian Colors.
She doesn't cite Walmart v. Dukes, Comcast v. Behrend, Genesis Healthcare v. Symczyk, or AT&T v. Concepcion, but I think she had more than today's decision in mind when she wrote that.