Well Raven Software just unionized and MS/Phil Spencer has said they will recognize said Union.Except.. unions are rare in high tech.
I can't think of a single current/recent union member co-worker.
Google? Nope. Apple Retail? this thread - one store. Microsoft? nope. IBM? not any more. The list goes on, dude - unions are very, very specific to industries and skew very much blue collar.
And if you hate unions, are willing to cross lines (I am) - why would you care about unions?