The U.S. Supreme Court announced Thursday that it will again take up a case from Illinois that seeks to do away with mandatory fees for public sector unions.
Nearly half of the states in the country allow them. The unions argue the bargaining process benefits all workers, even if they are non-members.
AFSCME spokesman Anders Lindall says this is an ongoing attack by large corporations to diminish rights of working people.
"The corporations, the CEOs, the politicians, they want all the power and influence for themselves. They're trying to use this political attack to manipulate the court, overturn settled law, and change the rules in a way that hurts working people."
Supporters of the lawsuit argue it's about the freedom to choose.
A decision in the case could happen by next summer. The high court deadlocked on the issue last year, but now there's a conservative majority among the justices.