Does the ruling help or harm unions in Illinois? (Twitter/@MattyFanatic)

Workers are not considered full government employees, so the decision will only apply to "partial public employees," like Pamela Harris who sued Illinois.

Harris is an in-home health care worker who was being paid with Medicaid funds, which made her a member of the Service Employees International Union, according to The Daily Beast.

Harris sued SEIU and the state, saying the dues are like forced associations and speech for workers. 

The National Right to Work Foundations president, Mark Mix said, "We applaud these home-care providers' effort to convince the Supreme Court to strike down this constitutionally dubious scheme, thus freeing thousands of home-care providers from unwanted union control."

The ruling does not extent to all public employees or unions. 

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