Critics of police unions provide a litany of anecdotal examples of the unions defending abusive, racist, and deadly officer behavior by bad actors who are far outnumbered by more caring and ethical colleagues. Former Minneapolis officer Derek Chauvin, for example, was defended by his union through misconduct claims that should have cost him his badge long before he knelt on George Floyd’s neck. The killing of Floyd has awakened what might be the first domestic union-critical campaign from the Left since the labor movement went mainstream in the 1930s. Yet in exposing police unions, activists risk inadvertently awakening the public to similar behavior by union leaders representing a variety of professions and trades — and right at a moment when teachers unions are stymieing not only attempts to reopen public schools but using their influence to clamp down on any and all student education until they deem the environment safe enough for their clients. “Suddenly, the Left is actively holding police unions accountable by stripping them of their power,” said Aaron Withe, national director of the Freedom Foundation public policy institute. “If they want to go down this road, and maintain any credibility, they will have to go full bore and apply the same standard for every employee union.” Colorado Springs Mayor John Suthers concurs, explaining the political ramifications of taking on police unions. “As people demand to know what stands in the way of...