Here is more info on the anti-SOPA efforts.
A number of boycotts has caused some firms to stop supporting it.
http://www.digitaltrends.com/opinion/the-439-organizations-sopa-opponents-should-worry-about/And the remaining firms' employees will see themselves removed from some invitation only events.
The big one to turn is the US Chamber of Commerce. I highly doubt the local Chambers know what this is about and if they did they would not support the national organization.
I do not understand why the Unions support this. This will make it very hard to organize. I think they can be turned.
Note that Walmart is on it, but Target is not. I can understand the NFL, but Time Warner has a huge ISP business. Also note that Blockbuster is not on it.
So, if you are concerned, then go through this list and agitate.
