The National Labor Relations Act protects the rights of workers who organize unions.  One thing the employer cannot do during an organization attempt is ask questions of the employees about the organizing activity and threaten the workers with fewer hours and less pay if they do form a union.  That appears to be what the Grand Hyatt corporation did when a worker tried to organize a union.  See San Antonio Express News story.  Now, they have to reinstate the employee and pay lost wages.  This came as a result of a National Labor Relation Board’s complaint.  The NLRB does not accept many complaints.  When they do, the employer needs to be ready.