Every week, U.S. workers sit through mandatory meetings where paid consultants discourage them from unionizing. The consultants are supposed to promptly disclose their names and fees to the federal government so that workers understand who’s lobbying them. But this system aimed at transparency still leaves workers in the dark, a HuffPost series has found.

Many consultants ― known legally as “persuaders” ― file their disclosure forms late, sometimes well after the union election has already ended. Or they provide incomplete information, withholding how much the employer is paying them. And although they’re supposed to make disclosures of their own, some employers fail to reveal how much money they spent countering the union…

… Documents and interviews show that workers often don’t have a clear picture of whom their employer hired and how much they paid them until the information is no longer useful…

... One prominent anti-union firm, the Labor Pros, frequently files its disclosures after they’re due, according to LaborLab’s analysis. The firm appears to have submitted one of its disclosure forms roughly seven years after consulting for a hotel. The Labor Pros did not respond to a request for comment...