Clashes between federal law enforcement agents and protesters in Portland, Oregon, have been major national news this week after reports emerged that, in addition to extensive use of tear gas, stun grenades, and rubber bullets, there have been instances where unidentified federal agents in unmarked vans are arresting and interrogating people and later releasing them without filing criminal charges. Details about the extent of the alleged practice are hard to come by at the time of this writing, but late last week Oregon Attorney General Ellen Rosenblum sued the Department of Homeland Security, U.S. Customs and Border Protection, the U.S. Marshals Service, and the Federal Protective Service arguing that the agencies’ actions are unconstitutional and asking for a temporary restraining order. Keep reading for more on this story and other news.