I’m sure that there have been plenty of Democrat infiltrators working for the government to “expose” the tea party groups as “terrorists” but no one took the bait.
However there have been instances where Democrat anarchists plotted to firebomb and kidnap at the 2008 GOP convention and it never rose above being treated as a “local” story and those convicted claimed they were set up by the government.
Like I said, I would not personally get involved with anyone proposing to violently damage the gummint but I do wonder why it does not occur to folks who DO want to harm gummint agents that in all probability the closest, most easily accessible target is right there at their own elbow....