Be wary of paramilitaries.
When the men with guns who have always claimed to be against the system start wearing uniforms and marching with torches and pictures of a leader, the end is nigh. When the pro-leader paramilitary and the official police and military intermingle, the end has come.
Most governments, most of the time, seek to monopolize violence. If only the government can legitimately use force, and this use is constrained by law, then the forms of politics that we take for granted become possible. It is impossible to carry out democratic elections, try cases at court, design and enforce laws, or indeed manage any of the other quiet business of government when agencies beyond the state also have access to violence. For just this reason, people and parties who wish to undermine democracy and the rule of law create and fund violent organizations that involve themselves in politics. Such groups can take the form of a paramilitary wing of a political party, the personal bodyguard of a particular politician—or apparently spontaneous citizens initiatives, which usually turn out to have been organized by a party or its leader.
—On Tyranny, by Timothy Snyder.
We appear to be about two-thirds of the way there.