You may write a letter to the Chief of Staff of the National Mediation Board at 1301 K. St. NW, Suite 250 East, Washington, DC 20005-7011; call the NMB Hot Line at 202-692-5050; or click here to email us. If this email link does not work for you, use your own email service and send a message to PDO@NMB.gov with a subject of "comment". Comments must be in English.