The National Association of Manufacturers (NAM) is suing the federal government over the new lobbying and ethics law, saying the measure infringes on their constitutional rights for freedom of association.

The complaint relates to a section of the law that would impose new lobbying disclosure rules. The provision was designed to provide more transparency in detailing members of so-called “stealth coalitions” — groups that use nondescript names to represent and lobby for specific industries in Washington.

But the industry group says the wording of the clause is so imprecise that it falls on a variety of organizations that it was not intended for and could require the disclosure of NAM’s member list. Failing to comply with the disclosure requirements could lead to criminal penalties.

In November last year, the trade group joined the U.S. Chamber of Commerce and the American Society of Association Executives in writing a letter to Senate Secretary Nancy Erickson and House Clerk Lorraine Miller asking for clarification in regard to the law.