https://www.theguardian.com/us-news/2021/apr/07/us-capitol-attack-surveillance-methods-protesters-first-amendment

The FBI has relied on a variety of technologies to track down rioters – and watchdogs are concerned those technologies could impede protesters exercising their first amendment rights

Over the past months, federal law enforcement has used a wide variety of surveillance technologies to track down rioters who participated in the 6 January attack on the US Capitol building – demonstrating rising surveillance across the nation.