Federal Distrct Court Judge Conley struck down parts of the anti-union bill supported by Wisconsin Governor Walker. The provisions that were struck were (1) requiring the re-certification of unions by a majority annually, and (2) making the payment of union dues voluntary.
The case is Wisconsin Education Ass’n Council, et. al, v. Scott Walker, et. al., 11-cv-428. Plaintiffs (the Unions) challenged the anti-union bill (known as “Act 10”) on two grounds: Equal Protection and First Amendment. You may read the opinion here.