A federal judge ruled Friday 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 said simply failing to display the new NLRB poster isn’t automatically a legal violation without other evidence of anti-union conduct.

The ruling disappointed business groups that argued the new poster is too one-sided and seems to encourage workers to join unions. The posters, to be displayed effective April 30, explain workers’ rights to bargain collectively, distribute union literature and engage in other union activities without reprisal. They also explain that workers have a right not to join a union.

“We are concerned that this decision will encourage frivolous lawsuits by unions against small business owners who refuse to comply,” said Karen Harned, an executive director of the National Federation of Independent Business, which challenged the poster rule.

Read more at Official Wire. By Sam Hananel, AP.

Get the news the mainstream media doesn't report. Sign up to get our daily newsletter and like us on Facebook