When the Brown Shirts show up to disrupt town hall meetings (http://videocafe.crooksandliars.com/heather/rachel-maddow-gop-thugishness-town-halls-called), progressives shouldn't just take it on the chin. They should assign security personnel to take pictures of the Brown Shirts and record them and figure out who they are. Each Brown Shirt so identified could be assigned to a handler who would follow the individual's activities on the web, etc and post about them so it would be clear that the Brown Shirt Movement is orchestrated by right wing interest groups. The network of Brown Shirts and their leadership could then be exposed. This would help to nip things in the bud if the Brown Shirts decide to escalate matters into outright domestic terrorism, which they very well might.
The FBI ought to be doing this if it is going to be worthy of the name of secret police, but until they do progressives can take steps to protect themselves and the country from these crazies.