What is the fine-grained topic of the following text: In the 2012 case Knox v. SEIU, Alito essentially invited labor’s foes to challenge the basic model of public-employee unionism, in which non-union employees can be made to pay dues to a union for bargaining on their behalf, representing them in grievance issues, etc. Only return the topic.
The 2012 Knox v. SEIU case and its impact on public-employee unionism