It sounds like they'd at least have more power than a single-employer union, by virtue of being larger and having more resources.

I'd much rather run a factory where only 10% of my workers may strike than one where 90% may strike.

	▲	s1artibartfast a day ago \| parent [-]
		It is usually like 2 or 3 and they will strike together. Having multiple keeps the unions in check and arguing for a pay raise for 60% of workers and nothing for 40%. I that case, the 40 would form their own union