"Right-wing vigilante patrols claiming to fill gaps in state security have popped up in several German states. The government has warned there's not a big leap between these groups and far-right terrorism."
See: Germany: Vigilante patrols pose far-right ‘terror threat’ (DW, link):
“Self-proclaimed citizen militias patrolling German towns are the “beginnings of right-wing terrorist potential,” according to the German Interior Ministry.”