There have been Bostonians contributing to the cause of the IRA, and I have seen several White Supremacist videos that make my skin crawl.
Those fomenting violence on that video should be watched closely, and/or simply deported for that reason alone.
If you want to examine the civil legal issues on cases like this -- go to the Southern Poverty Law Center site and check out their prosecution of white supremacists -- you can do it too! Put up or shut up, as someone just told me.
You sound like an underworked attorney.