MONDAY’S Supreme Court decision to block a class-action sex-discrimination lawsuit against Wal-Mart was a huge setback for as many as 1.6 million current and former female employees of the world’s largest retailer. But the decision has consequences that range far beyond sex discrimination or the viability of class-action suits.

The underlying issue, which the Supreme Court has now ratified, is Wal-Mart’s authoritarian style, by which executives pressure store-level management to squeeze more and more from millions of clerks, stockers and lower-tier managers....

There used to be a remedy for this sort of managerial authoritarianism: it was called a union, which bargained over not only wages and pensions but also the kind of qualitative issues, including promotion and transfer policies, that have proved so vexing for non-unionized employees at Wal-Mart and other big retailers.

For a time it seemed as if the class-action lawsuit might be a partial substitute. By drastically limiting how a class-action suit can be brought, the Supreme Court leaves millions of service-sector workers with few avenues to escape the grinding work life and limited opportunities that so many now face....