This has already happened in America which some posters eluded to.
Remember what happened after Americans had a belly full of our government sponsored lawless country killing violent borders?
They volunteered to assist in securing the borders and were attacked and called "Vigilantes".
“They volunteered to assist in securing the borders and were attacked and called ‘Vigilantes.’”
And it was none other than George W. (”see you at the signing”) Bush who called The Minutemen “vigilantes.”