Buonadonna Shoprite, 356 NLRB No. 115 (2011)

This case addressed the boundaries of an employer's Weingarten obligation.  An employee wanted to be represented by a different rep than the one who was available.  A manager wanted the employee to give a statement without his preferred rep.  The Board concluded that the employee was not entitled to the rep of his choice.  (The decision left unresolved the question of whether the employer's refusal to allow the employee to call the preferred steward during the meeting was unlawful.)

You can see Seth Borden's thoughts on the case here.