The Courier-Journal reports the employees filed the federal suit against the Jefferson County school district and the American Federation of State, County and Municipal Employees.
The suit alleges the requirement that nonmembers pay a "fair share" fee to the union is unconstitutional.
In response, Jefferson County Public Schools Chief Operations Officer Mike Raisor says union officials asked the district to stop collecting the fees from nonunion employees until further notice.
The suit asks that even if the court upholds the fees, it provides certain procedural protections to ensure nonmembers are not paying dues for political activities.
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