Around the country, public-sector unions are either wringing their hands or strategizing about a response to the likely demise of the agency shop and the ushering in of “right-to-work” for all government workers.

Later this year, the Supreme Court is expected to rule that workers who choose not to join the union that goes to the negotiating table for all employees in their bargaining unit cannot be compelled to pay a fee to cover that representation. Unions say that scrapping this requirement creates a free-rider problem — workers receive the benefits of union representation without paying a thing — and unlawfully takes union resources.

It would be perhaps the greatest victory for the anti-union right since the passage of the 1947 Taft-Hartley Act.