Three Hollywood unions slammed a Supreme Court ruling released Wednesday that sharply diminishes the power of public-sector unions by allowing workers to refuse to pay union dues or fees even while receiving the benefit of union contracts, calling the ruling a shameful decision that will lead to attacks on private-sector unions as well.

That seems likely as a political matter, and it may be true as a legal matter too, particularly in light of the Court’s probable turn even further rightward when retiring Justice Anthony Kennedy is replaced. The decision in the case, called Janus v. American Federation of State, County and Municipal Employees, is grounded in First Amendment prohibitions against compelled speech and compelled association, and cites private sector examples as well as public sector.