The National Labor Relations Board has ruled the retail giant Wal-Mart has violated the rights of striking workers. In a statement, the NLRB said Wal-Mart “unlawfully threatened, disciplined, and/or terminated employees for having engaged in legally protected strikes and protests.” The incidents include last year’s “Black Friday” protest that saw workers lead rallies at more than 1,000 Wal-Mart stores and another strike this past June. The NLRB says it will pursue charges, unless Wal-Mart can reach an agreement with the workers. The group OUR Walmart is organizing a new round of “Black Friday” protests next week.