Last month, the National Labor Relations Board (NLRB) issued a Final Rule requiring all employers under the NLRB’s jurisdiction to notify employees of their rights under the National Labor Relations Act (NLRA) with a workplace posting. The Final Rule is effective November 14, 2011.

As a practical matter, almost every private-sector employer in the USA falls under the NLRB’s jurisdiction, regardless of whether its employees are unionized. Exceptions include agricultural, railroad and airline employers. In addition, the NLRB has indicated it will not apply the Final Rule to some very small employers.

The workplace poster required by the Final Rule notifies employees they have the right to act together to...