Photo Credit: Kheel Center, Cornell University 

Beginning with the Taft-Hartley Act of 1947, petition of decertification could be filed with the National Labor Relations Board (NLRB) to determine if the employees wish to retain the individual or labor organization currently acting as their bargaining representative.  A majority of votes decides whether the union is maintained or decertified.

Source: National Labor Relations Board (1997), ‘Basic Guide to the National Labor Relations Act General Principles of Law Under the Statute and Procedures of the National Labor Relations Board’. 

See Methodological Appendix for further details.