For whom does this Court's affirmative consent waiver requirement set forth in Janus apply: nonmembers currently or previously employed in agency shop arrangements, like Mark Janus—as several lower courts have held—or employees, like Petitioners, who sign an agreement to pay a union, such as union membership card or dues deduction authorization?

Whether the affirmative consent waiver requirement set forth in Janus v. AFSCME applies to nonmembers currently or previously employed in agency shop arrangements, or to employees who sign an agreement to pay a union