The union representing 900 part-time faculty at Madison Area Technical College, also known as Madison College, sued the school on Monday.
Members of the bargaining unit argue they do not fall under the definition of public-sector employees in Gov. Scott Walker's anti-collective bargaining bill, Act 10, and should retain their collective bargaining rights.
"Our position is that (technical colleges) are an employer, but they aren't municipal employers, and people who work for them aren't state employees," said Mike Kent, president of the part-time teachers union.
The college said it would contest the lawsuit, which was filed Monday in Dane County Circuit Court before Judge Maryann Sumi.