The “Boogaloo” movement, which federal prosecutors describe as a “term used by extremists to signify a coming civil war and/or collapse of society,” has been linked to some online posts about protests over the death of George Floyd.

NBC News reported last weekend that members of the “Boogaloo” movement were seen at protests in states including Minnesota and Texas, as well as in Philadelphia.

The movement, which says it wants a second civil war organized around the word “boogaloo,” includes groups on mainstream internet platforms such as Facebook, Instagram, Twitter and Reddit, as well as fringe websites including 4chan, according to a report released Tuesday night by the Network Contagion Research Institute, an independent nonprofit organization of scientists and engineers that tracks and reports on misinformation and hate speech across social media.