The Writers Guild is only for writers and it strikes about every 10 years. IATSE has never had a strike in its 128 year history. It seems to be a distinct disadvantage not to use the most powerful tool unions have. To clarify, in the last negotiations, the members voted to strike by the smallest of margins (.6%) but the delegates overwhelmingly approved the new contract (74%). Certainly frustrating for the Locals that put in the long hours.