After a few minutes of research on Francis Fox Piven...someone I've never heard of before...it would seem she's been advocating revolution of one kind or another for decades. One of her earliest books was "The New Class War: Reagan's Attack on the Welfare State and Its Consequences," and a more recent was "The War at Home: The Domestic Costs of Bush's Militarism." Perhaps all Beck had to do was call attention to this person...her books and YouTube videos did the rest...with her own words.
Given that fact, though, it's obviously both wrong and stupid to threaten someone like this...just as it's wrong to try to silence Beck. Our best option is to encourage them both to talk freely...because Beck makes perfect sense most of the time, while Piven won't make sense to anyone over the mental age of 16 or so.