I agree that Wal-Mart complaining to the NLRB will achieve nothing, because the NLRB is a corrupt organization. However, Wal-Mart probably *has* to do this first, before it can sue in federal court.
And that is where the real action is, because Wal-Mart has long rejected legal settlements when it is sued, and has a brigade of very experienced and very successful lawyers who are probably thrilled with the idea of going after a “hard target” like the UFCW.