Not meant as a scare tactic...scare in to doing what? It has already been volunarily done.
There are a lot of multi lingual crew of all sorts around. If you as a bulk recruiter needed crew, would you willingly take a known union member from a radical rabid union such as you might think BASSA? Wouldn't you assume that any ex BA cabin crew were more than likely a union member? In which case you would bun their appication straight away.