There is a very important article over at LRC by Paul Rosenberg on the recent pre-crime arrest of Brandon Raub based on what he wrote on his Facebook page.
The article identifies the sentences that Raub wrote that mostly likely got the Secret Service and FBI all up in a lather. They most are centered with "revolution". The Rosenberg article is must reading.
Once you finish that, head on over to an article Murray Rothbard wrote in 1969, The Meaning of Revolution. As always Murray's thinking was decades ahead of most.