The case before the labor board covers far more industries.
The labor board's decision did not look at the store's financial results, however.
Starting this month, the labor board has three new members.
Exactly what the union wants the labor board to do about the book has not been disclosed.
Then the union would complain to the labor board, which could bring the matter to court.
A fact finding report was issued by the labor board.
During his 25 years with the labor board, he took part in more than 25,000 decisions.
But it is also pressing its case before the labor board.
The next step is for the labor board to conduct a vote by all of the students who would be covered.
He said the decision to sign was not related to the labor board's hearing.