A federal judge has declined to give final class certification to a suit by former Wal-Mart janitors over the labor practices of the world’s largest retailer.

On June 25, Chief U.S. District Judge Garrett Brown in Trenton, N.J., found that because the plaintiffs worked for a variety of Wal-Mart contractors around the county, not for the company directly, they could not show they were “similarly situated” for class action purposes.