A trio of far-right, pro-gun provocateurs is behind some of the largest Facebook groups calling for anti-quarantine protests around the country, offering the latest illustration that some seemingly organic demonstrations are being engineered by a network of conservative activists.

The Facebook groups target Wisconsin, Ohio, Pennsylvania and New York, and they appear to be the work of Ben Dorr, the political director of a group called “Minnesota Gun Rights,” and his siblings, Christopher and Aaron. By Sunday, the groups had roughly 200,000 members combined, and they continued to expand quickly, days after President Trump endorsed such protests by suggesting citizens should “liberate” their states.