Frederica Freyberg:

A lawsuit has been filed over the state’s near total ban on collective bargaining for most public employees. Act 10 was enacted under former governor Scott Walker in 2011, prompting massive protests in and around the state Capitol. On Thursday, seven unions representing teachers and other public employees filed the lawsuit, arguing Act 10 violates the Wisconsin Constitution’s equal protection guarantee because the law exempts police and other public safety workers from its union limitations.