CHICAGO — A Wisconsin judge on Thursday struck down the state’s controversial law that curtailed the collective bargaining powers of most public unions and raised pension contributions and health care premiums, concluding that lawmakers violated state open-meetings rules in their haste to pass the legislation.

Dane County Circuit Court Judge Maryann Sumi issued a 33-page ruling on Thursday that the legislative conference committee had failed to provide proper notice of their March 9 meeting, during which they stripped fiscal elements from the bill and passed the remaining pieces.

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