Those old enough to remember, such as yours truly, will recall that the US had a heady bout with home-grown revolutionaries back in the 1960s and 1970s, The main group was called the Weather Underground. They were responsible for a number of bombings, but were out to harm infrastructure, not people.
The group went out of business soon after the Vietnam war, which had prompted them to organize in the first place. Many of them were wanted by the FBI and one-by-one they surrendered to the police over the years. Most got off with a fine and probabtion. Only 2 went to jail and that's because they were part of an aborted attempt to rob an armored car that resulted
the klling of 2 guards.
It seems that something like this is always taking place somewhere in the world.