A split U.S. Supreme Court dealt a long-anticipated blow to teachers unions and other public employee unions on Wednesday, ruling that public employees can’t be required to pay dues to unions that bargain on their behalf.

The decision won’t have much of an impact in Michigan, where so-called right-to-work legislation already outlawed mandatory dues, which are also known as “agency fees.” After that law was passed in 2012, union membership and revenues in Michigan declined.

National teachers unions are bracing for a similar hit in the 22 states where agency fees had been allowed.

Be sure to check out this morning’s story from Chalkbeat’s national reporters about the likely fallout of the 5-4 ruling in Janus V. AFSCME.

For more local coverage, take a look back at our story about the impact of right-to-work on Michigan teachers unions.