The enemy is not the upper class
The enemy is not the underclass
The enemy is the political class
You owe the "99%" nothing.
They are a fragile alliance with many rifts and they will eventually betray you again.
Support the alliances that benefit you long- term.
For example, I am far from rich and have physical disabilities and other mental health issues besides AS. It would be logical to a lot of people to think that it would be best for me to be a democrat and support OWS. Well, my social views are nearly polar opposite of the democrats and I don't have a good future ahead of me by staking my future on being employed by others. For me, my best chance is to align with the more independent-thinking types. Our economic views vary slightly, but that won't matter so much if we are free to make our own living as we see fit without choking on red tape.
Playing socialist revolutionary fighting a class struggle is a popular bandwaggon right now, yet most of them are not old enough to remember, nor have done the historical research to understand all the ramifications of what they are asking for. If you do not like them, you will hate the society they stand for.
Rather than tell you what groups I think you should join, first, what do you want out of life? A career, education, family, living arrangements, etc.?
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"Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars."
- Unknown
"A fear of weapons is a sign of ret*d sexual and emotional maturity."
-Sigmund Freud