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Collective bargaining gives you the legal right to vote. If you are not in, you have no voice, with regard to a vote. That is the difference between negotiation and effective consultation.
Thats a bit rich considering BASSA has proven unable to either negotiate or carry out effective consultation. If you are unable to vote it still seems that the union should negotiate on behalf of all personnel in that work unit. A government governs for the whole country not just the 35% who voted for it.
If I were BA I would run a parallel vote for all CC. They seem to have a better idea of the concerns of CC than BASSA and they certainly have a vested interest in the opinions of all.
Regards