The Washington area has a long and mostly proud tradition of houses that lend themselves as venues for up-and-coming bands. But in the last few days, some residents of those houses have become guarded after discovering their homes’ names and addresses targeted in online message boards populated by members of the white nationalist movement known as the “alt-right.”

Sites like 4chan and Reddit, along with even more unfiltered corners of the internet, have seen the emergence of threads in which users encourage each other to post addresses of houses that host concerts and other arts programming around the country, and to call local authorities to report safety and building-code violations in hopes of getting the venues shut down. The threads appear to be nominally inspired by a December 2 fire at an Oakland, California, warehouse that killed 36 musicians and concertgoers, but the message-board users also make no attempt to hide their political motivation.

“These places are open hotbeds of liberal radicalism and degeneracy and now YOU can stop them by reporting all such places you may be or may become aware of to the authorities, specifically the local fire marshel [sic],” reads the original post on a 4chan thread that has since been archived. “Watch them and follow them to their hives. Infiltrate social circles, go to parties/events, record evidence, and report it. We’ve got them on the run but now we must crush their nests before they can regroup! MAGA my brothers and happy hunting!”