MADISON, Wis. (AP) â The U.S. 7th Circuit Court of Appeals has rejected a request from two Wisconsin unions to re-hear an appeal they filed of Gov. Scott Walker's law effectively ending collective bargaining for most public workers. A three-judge panel of the appeals court in April rejected the appeal made by union chapters representing city of Madison and Dane County public workers. The unions requested another hearing before all judges on the court, but that was rejected on Thursday. The unions could appeal to the U.S. Supreme Court. The unions argued in their lawsuit that the 2011 law violated their rights to assemble and equal protection. U.S. District Judge William Conley upheld the law last year, siding with Walker that the law is constitutional.