I also agree with Messers, Chamber and SDT, bugger strikes, these days you can be creative with industrial action as well as not being overt. Find out which managers are your main bugbears, find out what they get bonused for and target them, all legally and by that wonderfully explicit book. Be discerning in your action and hurt in ways that show power but don't decimate. Your intention is not to destroy the company, it's to get treated better in your job.
Timing is critical also, make sure if people are leaving, they leave en mass. Most importantly let managers know why things are happening and give them the ability to bargain out. Don't build big walls and keep your requirements reasonable and work towards resolution. Sometimes in serious disputes people lose sight of intention and get all keen on destruction. They get into ego battles which don't help anyone.
Good luck people and I'm glad I'm not dealing with "the buckets only so deep" CIA anymore.