things like negotiating committee briefings, or anything relating to non disclosures should be in closed session.
But, if you want to vote on something it is prudent to come out of executive session and bring the issue out into the open.
Move the issue, second it, discussion and vote. the mover, of the motion, resolution, etc should be known. The seconder should be known. the vote should be recorded. A general summary of the discussion should be in the minutes. if a roll call vote is taken, all of that "vote tally" must be properly recorded.
Voting should not happen in a closed session. (emphasize should not). A union functions most efficiently and with the most amount of unity when it's business, which is funded by the dues payers is witnessed by the dues payers. If those dues payers cannot be present, then they should be able to read the minutes. they paid for those minutes with their dues.
I't's all about honoring the inverted pyramid that ALPA is. in ALPA, the membership is at the top of the pyramid.
I recall the closed session "joint venture flying agreement" that was nearly passed at CAL. This was in CLOSED session. The goal of the master chair at that time was to discuss it in the blind and then to come out of executive session and then pass it in the open. However, no MEC members were allowed to bring the LOA/MOU out of the MEC room and our members were not allowed to see the documents nor were we allowed to consult other attorneys. That sort of closed session is exactly what should NEVER occur in a union. If it had passed, the scope section would have been gutted and all of that would have been without accountability to the membership. There are dangers in executive session that are easily abused or mis-used. Even if not intentional., it can have disastrous results.