I'm reading an interesting article by SMU Law professor Charlie Morris -- Members-Only Collective Bargaining: Get Ready for an Old Concept for a New Use. Professor Morris describes it thus:
It consists of a practice and procedure whereby a minority union engages in collective bargaining for its members only―but not for any other employees. It is an active process that continues until that union represents a majority of all the employees in an appropriate bargaining unit― if and when that occurs―at which time the union becomes a conventional majority-exclusive union obligated to represent all employees in the unit.
He predicts that "a proposal to validate that process will likely be submitted to the [NLRB] soon."
Hat Tip: Paul Secunda at Workplace Prof Blog.