Today, the Supreme Court ruled that public sector unions have to get "affirmative consent" from non-members if they want to charge them for things like political spending. The case involves the corrupt practice in which public sector unions charge n0nunion employees fees to support political activities, unless the employee "opts out" of the fee. Thus, state employees are compelled to subsidize union speech unless they take action to opt out. This arrangement violates long-standing precedent against compelled speech.
Today's decision in Knox v. Service Employees International Union (SEIU) requires an "opt-in" approach for certain types of union assessments. I explain more about the background and impact of this case over at the Manhattan Institute's excellent Point of Law blog.