WASHINGTON (AP) — A judge has ruled the National Labor Relations Board can require most private businesses to put up posters telling workers they have a legal right to form a union.

But U.S. District Judge Amy Berman Jackson limited how the board can enforce the requirement. She says simply failing to display the new NLRB poster isn't automatically a legal violation without other evidence of anti-union conduct.

The new posters are required effective April 30. They explain workers' rights to bargain collectively, distribute union literature and engage in other union activities without reprisal.

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Berman's ruling Friday disappointed business groups that argued the poster is too one-sided and seems to encourage workers to join unions.

Labor unions call the poster a positive step in letting workers know their rights.

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