While any store might have a management or policy problem, this story doesn't ring true to me. To find out that a union is driving it makes it even more suspect.
The act of issuing reprimands over the PA is the least TJ thing I can imagine. Far worse than any causes listed for the employee.
I don't know if I've ever even heard the PA used in our TJs. They tend to ring bells.
[Edit - deleted question which could lead directly to political discussion]