Public-sector unions are facing steep falls in revenue and trying to prevent the loss of members in the wake of a recent Supreme Court ruling.

In New York, Pennsylvania and Illinois, state governments have stopped collecting millions of dollars in agency fees following a high court ruling banning the practice. Before the ruling, public workers in 22 states who didn’t want to join a union were often required to pay agency fees, which cover collective bargaining costs and can equal as much as 90% of dues paid by members.

...