Enough is enough, the Supreme Court ruled today in Harris v. Quinn regarding the power of government to force public employees to associate with a labor union and pay for its speech. Although the Court did not overturn its 1977 precedent, Abood v. Detroit Board of Education, allowing states to make their workers contribute to labor unions, it declined to extend that principle to reach recipients of state subsidies—in this case, home-care workers who receive modest stipends from the state of Illinois’ Medicaid program but are not properly considered “employees” of the state.

The Court is right that Abood is “something of an anomaly” because it sacrifices public workers’ First Amendment rights of speech and association to avoid their “free-riding” on the dues of workers who’ve chosen to join a union, the kind of thing that rarely if ever is sufficient to overcome First Amendment objections. But Abood treated that issue as already decided by prior cases, which the Harris Court recognizes it was not–a point discussed at length in Cato’s amicus brief. Abood was a serious mistake, the Harris Court concludes, because public-sector union speech on “core issues such as wages, pensions, and benefits are important political issues” and cannot be distinguished from other political speech, which is due the First Amendment’s strongest protection. A ruling along those lines would spell the end of compulsory support of public-sector unions, a major source of funds and their clout.

It was enough, however, in Harris for the Court to decline Illinois’ invitation “to approve a very substantial expansion of Abood’s reach.” Illinois claimed that home-care workers were public employees for one purpose only: collective bargaining. But these workers were not hired or fired by the state, supervised by the state, given benefits by the state, or otherwise treated as state workers. And for that reason, Abood’s purposes, which relate only to actual “public employees,” simply do not apply. Were the law otherwise, the Court observed, “a host of workers who receive payments from a governmental entity for some sort of service would be candidates for inclusion within Abood’s reach.”

While Harris is not a watershed opinion that remakes labor law consistent with First Amendment principles, it does put an end to the forced unionization of home-based workers, a practice that has spread to nearly a dozen states and had provided a substantial number of new workers to the labor movement in recent years. Harris also lays the groundwork for a challenge to what it calls “Abood’s questionable foundations.” If recent Roberts Court precedents like Shelby County and Citizens United are any guide, Harris is a warning shot that the Abood regime is not long for this world and that the next case will be the one to vindicate all public workers’ First Amendment rights.