Supreme Court Questions Labor-Management ‘Neutrality’ Pacts : NPR

The justices are examining the legality of a key union organizing tool called a neutrality agreement. Under such a pact, employers pledge to remain neutral during union organizing campaigns. In exchange, unions promise not to picket, boycott or strike.

http://www.npr.org/2013/11/13/245057690/case-tests-high-courts-stance-on-unions-and-organizing?live=1