The U.S. Supreme Court’s decision in June striking down union “fair share” fees has energized a new attack on mandatory bar association dues.

Two Oregon lawyers filed a federal lawsuit that relies on the high court’s 5-4 ruling in Janus v. AFSCME to mount a First Amendment challenge to mandatory bar dues. In Janus, the conservative majority overruled 41-year-old precedent that upheld fees paid by nonunion members for their share of collective bargaining costs.