The National Labor Relations Board has three services that are remaining open during the government shut down.  Only government activities which are necessary to prevent an imminent threat to the safety of human life or the protection of property may be undertaken when there is no specific budget authority.  

The three services/programs are:

Necessary court actions: To protect federal legal actions already taken
Office of Inspector General hotline: Necessary for safety of life and protection of property
Emergency Contact: Necessary for safety of life and protection of property or to protect federal legal
actions already taken

Other services and programs are closed.  The number of employees who were not furloughed is 11 of the total agency's 1611 employees.