When the government charges someone with a crime and someone asks “whats the other side”, do you say the same thing?
This would go to trial if not settled. Only then would the labor boards decision be based on an actual weighing of all evidence.
Arbitration and mediation is a far more common way to deal with disagreements in civil society, and that's what the board has done here.
Hardly a finding of guilt.
If a violation is believed to exist, the region will take the case before an Administrative Law Judge who will conduct a hearing. The decision of the Administrative Law Judge may be reviewed by the five member Board. Board decisions are reviewable by United States Courts of Appeals. The Board's decisions are not self-executing: it must seek court enforcement in order to force a recalcitrant party to comply with its orders.
https://en.wikipedia.org/wiki/National_Labor_Relations_Board...
The thing that was found to be unsupported by the evidence.